Submarine Electronics: Module, Assembly and Other Associated Methods

Abstract

A subsea electronics system (2) with a subsea electronics apparatus (10) and a mounting base (12). The mounting base (12) has at least one recess (30) for receiving a first protrusion of the subsea electronics apparatus (10). The subsea electronics apparatus (10) has an electronics module (16) housed in a housing portion defining the first protrusion. The subsea electronics apparatus (10) has a second module (18) housed in a second housing portion defining a second protrusion.

Description

1 / 31 Submarine Electronics: Module, Assembly and Other Associated Methods

[0001] This invention relates to underwater electronics, particularly, but not exclusively, an apparatus comprising an underwater electronic module comprising an underwater electronic assembly; and associated methods. FUNDAMENTALS

[0002] Subsea electronic devices are frequently used in subsea equipment, such as in oil and gas equipment as part of a subsea well; or used in a subsea or offshore power installation, such as for a wind turbine or tidal generator, CO2 storage, subsea electrification / substations, offshore hydrogen production, or similar. A subsea electronic module typically houses electronic components for control, power supply, power distribution, or other functions. The electronic components are typically provided in a housing to protect them from environmental conditions, particularly seawater ingress (which may be at high pressure due to depth and / or subsea conditions) and contaminants. Historically, a subsea electronic device module typically includes electronic components that are mounted on a chassis, and the chassis is inserted within a sealed housing.

[0003] Applicant's copending patent applications WO2022263480 and GB2583711, the content of which is incorporated herein by reference, disclose underwater electronic apparatus comprising a compartment, a chassis for insertion into the compartment and at least one electronic component mounted on the chassis.

[0004] It may be the object of one or more aspects, examples, embodiments or claims of the present disclosure to at least mitigate or improve one or more problems associated with the state of the art, such as those described herein or elsewhere. Petition 870250100808, dated 04 / 11 / 2025, page 9 / 44 2 / 31 BRIEF SUMMARY OF THE DISCLOSURE

[0005] According to one aspect, an underwater electronic apparatus is provided. The apparatus may comprise an underwater electronic control apparatus, such as with a power and communications gateway module.

[0006] The apparatus may comprise a main body. The main body may comprise an external compartment. The external compartment may define and separate an exterior of the apparatus from an interior of the apparatus. The apparatus may comprise at least one subunit. The subunit may comprise a module. The module may comprise an electronic module. The module may comprise the power and communications gateway module. The apparatus may comprise an assembly of the main body and at least one subunit. When assembled, the apparatus may comprise the main body with the subunits. The subunits may be mounted or attached to the main body. The subunits may be mounted or attached to the main body before locating the submarine. For example, the apparatus may be assembled on the surface (e.g., before submerging in fluid, such as water). In at least some instances, the subunits may be releasably attached to the main body.

[0007] The apparatus can be configured for at least two subunits. The main body can be configured to comprise or receive at least two subunits. In at least some instances, the apparatus comprises the main body and at least two subunits. Each subunit can comprise a portion of the external compartment. Therefore, the exterior of the apparatus can be defined by a combination of the main body and the subunits. The subunits, when mounted with the main body, can define a protrusion of the main body. Each subunit can effectively be a respective protrusion of the main body.

[0008] In at least one example, an underwater electronic apparatus is provided, the underwater electronic apparatus comprising a first module, the first module being an electronic module housed in a portion of Petition 870250100808, dated 04 / 11 / 2025, page 10 / 44 3 / 31 compartment that defines a first protrusion of the underwater electronic apparatus; the underwater electronic apparatus comprising a second module, the second module being housed in a second portion of the compartment that defines a second protrusion of the underwater electronic apparatus.

[0009] In at least some examples, an underwater electronic control apparatus is provided, the apparatus comprising: a main body with a compartment defining a portion of the exterior of the device; the main body being configured to support at least two subunits within it; and at least one subunit comprising a power and communications gateway module.

[0010] The apparatus may comprise a pressure compensator. The pressure compensator may comprise an oil-filled pressure compensator. The pressure compensator may comprise a flexible element, such that an internal volume of the pressure compensator is variable in response to a pressure differential between the inside of the pressure compensator and the outside of the pressure compensator. The pressure compensator may comprise an inflatable molding chamber. The inflatable molding chamber may comprise an external surface or portion. The external surface or portion may be in fluid contact with a fluid external to the apparatus, such as water, in which the apparatus may be submerged in use. The inflatable molding chamber may comprise an internal portion, the internal portion defining a fluid chamber sealed from the outside of the inflatable molding chamber. The internal portion may comprise an internal fluid.For example, the apparatus may comprise an inert fluid surrounding the electronic components and / or other internal components. The internal fluid may comprise an insulating fluid (e.g., electrically and / or thermally). The apparatus may be sealed to generally prevent the ingress of external material, such as external fluid (e.g., seawater or similar) and / or contaminants. The fluid. Petition 870250100808, dated 04 / 11 / 2025, page 11 / 44 4 / 31 internal may be in fluid communication with other parts of the device, such as the interior of the main body and / or subunits.

[0011] The subunit comprising the power and communications control module may be a first subunit. The apparatus may comprise at least one second subunit. The first and second subunits may be arranged side by side. The first and second subunits may be arranged horizontally relative to each other. The first and second subunits may be located at intervals so that the apparatus is balanced, such as in terms of weight, mass, volume, buoyancy, etc. For example, the first and second subunits may be located on a respective half or side of the main body. The subunits may be spaced at a relative distance from a center or periphery of the main body to provide a balanced apparatus.For example, a first, larger and / or relatively heavier subunit may be located relatively closer to the center of the main body compared to a second, smaller and / or relatively lighter subunit, which may be located relatively closer to the periphery of the main body than the first subunit. A subunit, such as the second subunit, may comprise the pressure compensator. Alternatively, the second subunit may comprise a second electronic module. The second electronic module may comprise a second power and communications module. In at least some examples, the subunit comprising the pressure compensator may also comprise electronic components. In at least some examples, the main body is configured for at least three subunits. The apparatus may comprise three subunits.For example, the device may comprise two electronic modules in their respective subunits and the pressure compensator in the third subunit. The three subunits may be located spaced in a triangular arrangement within the main body. The proportions of the triangle, such as side lengths and internal angles, may be dependent on... Petition 870250100808, dated 04 / 11 / 2025, page 12 / 44 5 / 31 respective relative properties of each of the subunits. For example, a corner of the triangle may be closer to a center for a larger or heavier subunit compared to a corner for a relatively smaller or lighter subunit. Consequently, the subunits can be positioned to provide a balanced apparatus, such as with buoyancy where the apparatus is horizontal and / or where a center of buoyancy corresponds to a center, such as a geometric center or centerline, of the apparatus.

[0012] The first and / or second subunit may comprise one or more of: a battery; a transformer; an accumulator; a ballast. In at least some examples, one or more of the subunits may comprise a combination of components. For example, a single module may comprise both a pressure compensator and a battery. Similarly, one or more subunits may comprise an electronic module (e.g., a PCGM) and a battery or transformer.

[0013] The subunit may define a body portion, the body portion being additional to the main body. The body portion may comprise a body portion that is at least partially hollow. Therefore, the apparatus may comprise the main body and at least one body portion defining an internal housing. The main body may comprise a cavity. The cavity may be an internal cavity that is sealed from or against the exterior of the main body. The body portion may comprise a body portion cavity. The body portion cavity may be sealed from or against an exterior of the body portion. The body portion cavity may be connected to the main body cavity. Therefore, the apparatus may comprise at least a single internal cavity, sealed from or against an exterior of the apparatus, so that components may be housed in the apparatus in a protected manner sealed from the exterior of the apparatus.The main body may be in fluid communication with the subunits. The subunit may comprise a capsule. The subunit may be oriented. Petition 870250100808, dated 04 / 11 / 2025, page 13 / 44 6 / 31 vertically. The subunit may comprise a container. The subunit may comprise a prism or cylinder. The prism or cylinder may be oriented vertically, with its longitudinal axis aligned vertically. The prism or cylinder may be closed at one end, the closed end being distal to the main body. The prism or cylinder may be open at one end, the open end being for sealing connection to the main body. The open end may provide communication and / or transfer between the subunit and the main body. For example, the open end may provide fluid communication and fluid transfer between the main body and the subunit, such as internal fluid for pressure compensation. Additionally, or alternatively, the open end may be for signal transfer or communication, such as power and / or control signals, between the subunit and the main body.

[0014] Each subunit may comprise or define a housing within it. The device may be configured or configurable to comprise at least two distinct housings. Each housing may be defined by a housing compartment. The housing compartment may be defined by the exterior of the subunit. In at least some examples, the housing compartment of a first housing may be discrete and separate from the housing compartment of a second housing. For example, a first housing may be defined in the first subunit; and a second housing may be defined in the second subunit. The device may be configured or at least configurable to comprise at least two distinct housings, each housing being suitable for housing a respective electronic module. Each housing may be suitable for receiving or housing an electronic module.Additionally, or alternatively, at least one of the housings may be suitable for housing a compensating module. For example, the compensating module may comprise a pressure compensating module, such as with an inflatable shaping chamber inside the housing to balance external and internal pressure. Petition 870250100808, dated 04 / 11 / 2025, p. 14 / 44 7 / 31

[0015] The device may comprise at least two distinct subunits. Alternatively, in at least some instances, the device comprises only a single subunit. For example, where a second subunit can be received, mounted, or otherwise incorporated into the device, the device may comprise redundant space in the absence of a second subunit. The redundant space may be configured for receiving or adding a second subunit, such as to be added in the future. For example, the device may be adaptable to provide additional or alternative functionality after initial installation or for deployment in a subsequent installation. Additionally, or alternatively, the provision of the possibility of at least two subunits may provide a reduction in product inventory, such as a reduction in the total number of different types of devices or at least constituents thereof.For example, the device may comprise a universal main body, the universal main body being a single configuration for multiple different functionalities or applications. For example, the same type of universal main body may be suitable for use with a variety of different types and / or compositions of subunits. The device may comprise at least two distinct housings. Alternatively, in at least some instances, the device comprises only a single housing. For example, where a second housing can be received, mounted, or otherwise incorporated into the device, the device may comprise a redundant space in the absence of a second housing. The redundant space may be configured to receive or add a second housing, such as to be added in the future.

[0016] The apparatus may comprise at least two ports, each port being configured to receive or mount a respective subunit. The ports may be configured for mounting a respective subunit, such that the subunit is connected in a sealed manner to the main body. In at least some examples, at least one of the ports may Petition 870250100808, dated 04 / 11 / 2025, page 15 / 44 8 / 31 comprise a redundant port. For example, the device may comprise a redundant subunit or a suppression cover for at least one of the ports. The redundant subunit may comprise a functionally redundant subunit, such as one devoid of components or functionality – other than, for example, buoyancy, balance, etc. Alternatively, the redundant subunit may comprise functionality, such as electronics or control functionality. The redundant subunit may comprise a backup subunit, such as for use in the event of failure of another (non-redundant) subunit.

[0017] The device can be configured to mount on a mounting base. The main body can be configured for mounting on the base. In at least some examples, the base is a subsea base associated with or associable with subsea equipment, such as a subsea infrastructure or installation. The mounting base can be located or positioned subsea prior to mounting the device. The mounting base can be configured to receive the device, with the mounting base configured to assist in aligning and / or orienting the device during mounting on the mounting base. In at least some examples, the mounting base comprises one or more portions to receive the device. The mounting base can be configured to receive the subunits on or through it. In at least some examples, the mounting base comprises at least one opening or recess to receive a subunit.The mounting base and the device can be configured in such a way that at least one of the subunits can effectively function as a guide post to align and / or orient the device during mounting of the device onto the mounting base. In at least some examples, multiple subunits are used as multiple guide posts. The subunits can function as sequential guide posts, such as where a longer or more downward-extending subunit functions as a first guide post for initial locating and / or centering of the device as it is moved to or within the mounting base; and. Petition 870250100808, dated 04 / 11 / 2025, p. 16 / 44 9 / 31 A shorter or less downward-extending subunit is used as a second guide post after the first subunit has been at least partially extended to or through the mounting base.

[0018] The main body may comprise or house one or more connectors. For example, when the device comprises power and communications gateway modules, the main body may comprise one or more connectors for transmitting power and / or control signals. In at least some examples, the main body may comprise or house all the connectors of the device. The main body may comprise a hollow body, defining an internal volume distinct from an external one of the main body. The internal volume may be sealed from or against the exterior of the body. Each connector may allow one or more lines or cables to effectively pass signals into the interior of the main body, so as to facilitate the transmission of power and / or communication signals into and / or out of the interior of the main body. The device may comprise a terminal or node, such as an end node, for each line or cable.Another terminal or node of each line or cable may be located distal to the device. For example, each line or cable may be for transferring power and / or communication signals between the device and another external device and / or equipment, such as a remote power and / or communications unit. For example, the device may be connected to a communication and power hub, such as underwater and / or on the surface.

[0019] The main body may comprise a connector portion for housing connectors. The main body may comprise a non-connector portion, configured to be devoid of connectors. The main body may comprise a reduced profile or dimension in the non-connector portion. The reduced profile may be achievable where it is not necessary for connector lengths to be internally housed within the main body (e.g., corresponding to where no connector is located, or areas or portions where no connector is located). The main body may comprise a Petition 870250100808, dated 04 / 11 / 2025, page 17 / 44 10 / 31 Increased profile or dimension in the connector portion. The increased profile or dimension may be relative to a corresponding profile or dimension in the non-connector portion. The reduced profile or dimension may contribute to a reduced total or overall volume of the main body, such as an internal or fluid volume of the main body. The reduced volume may be relative to a corresponding main body or main apparatus, wherein a uniform or equal profile or thickness would be maintained corresponding to that used or required for the connector portions. The main body may comprise a connector portion and an auxiliary access portion. The connector portion may be discrete from the auxiliary access portion. The auxiliary access portion may be for an auxiliary tool or apparatus to access the main body or apparatus.For example, the auxiliary access portion may be configured to provide access for a tool or ROV, such as for engagement with a locking portion. In at least some examples, the main body comprises a thicker portion to accommodate the connectors and a relatively thinner portion. The relatively thinner portion may be to provide access, such as for a tool or device (e.g., a gripper, ROV, or other tool) to grip, manipulate, or otherwise mechanically interact with the main body. Additionally, or alternatively, the relatively thinner portion may be to provide a reduced volume of the interior of the main body (e.g., compared to an equivalent main body whereby a dimension, such as thickness, is uniform for the connector portion and the non-connector portion).

[0020] The main body may consist of at least two main compartment portions. For example, the main body may comprise at least two shell portions that define the internal volume between them. The main body may comprise an upper main body compartment and a lower main body compartment. The lower main body compartment may comprise a main body compartment base plate. The upper main body compartment may Petition 870250100808, dated 04 / 11 / 2025, page 18 / 44 11 / 31 Understanding the connector portion. The lower main body compartment can be configured to receive one or more subunits. The main body compartment can be adapted to balance the device. For example, the main body compartment can be oversized to provide additional weight / mass / displacement to the overall device. The additional weight / mass / displacement can be provided in the lower main body compartment portion (e.g., to help define a center of gravity / buoyancy of the device). For example, providing extra weight / mass / displacement in the main body compartment can effectively act as ballast to increase the overall mass / weight / displacement and / or decrease the center of gravity / buoyancy of the device. The main body compartment can be asymmetrical.For example, the main body compartment may be oversized in one half, side, or portion corresponding to a subunit or module associated with a relatively smaller weight / mass / displacement than another subunit or module (or relative to the position of a missing or absent subunit or module). The asymmetrical, oversized compartment portion may balance the apparatus by compensating for a relatively larger / heavier first module relative to a second module (e.g., with an increased mass in the compartment on the side for the second module relative to the side of the compartment for the first module).

[0021] The main body may comprise the locking portion. The locking portion may be for locking the main body to the base. The locking portion may comprise a central portion. The locking portion may be for receiving a locking mechanism. In at least some examples, the locking portion comprises the locking mechanism. The locking mechanism may be for locking the device to the mounting base. The locking portion may be located on or adjacent to the auxiliary access portion. The auxiliary access portion may be for a tool, ROV, or similar to access the locking portion and / or the Petition 870250100808, dated 04 / 11 / 2025, page 19 / 44 12 / 31 locking mechanism. The auxiliary access portion may correspond to the reduced profile or thickness portion.

[0022] The apparatus may comprise an optical connector. The optical connector may comprise an oil-filled pressure-balanced connector. The optical connector may comprise a tube or tubing. The tube or tubing may be oversized, such as over-elongated. For example, the tubing may be longer than strictly necessary to provide the optical connection. The tubing may accommodate fluid. Providing an oversized tube or tubing may provide a fluid reservoir, such as for pressure balancing. The fluid reservoir may be enlarged by providing increased tubing length. The increased tubing length may be relative to a length collinear with the connector. For example, the optical connector may comprise a tubing length not collinear with a connecting axis. The tubing, as at least the oversized portion, may be located on or within the main body.For example, the pipe or tubing may be coiled, wrapped, or otherwise extended around or within the main body.

[0023] The module included in the subunit may comprise a module with components and / or functionalities similar to those disclosed in WO2022263480 or GB2583711. The module may comprise a power and communications gateway module. A subsea electronic assembly may be provided, such as for mounting in a cavity of one / each housing compartment. The enclosure may comprise or be the canister. The subsea electronic component assembly may comprise a chassis and a sub-assembly of electronic components. The housing compartment may be elongated and define an axial and a radial direction. The axial direction may be oriented vertically in use, such as when installed. In at least some examples, the subsea electronic component assembly may comprise a second sub-assembly of electronic components movably mounted on the chassis and movable between a position Petition 870250100808, dated 04 / 11 / 2025, page 20 / 44 13 / 31 retracted for insertion of the subsea electronic component assembly into the housing compartment cavity and an expanded position where the second subassembly of electronic components is moved away from the chassis to contact a surface of the housing compartment cavity during use. In such examples, the second subassembly of electronic components may be mounted on an opposite side of the chassis to the electronic component subassembly. In such an example, the electronic component subassembly and the second electronic component subassembly may be pressed against opposite surfaces of the cavity in the expanded position. As per the present disclosure, a subsea electronic module comprising the subsea electronic assembly described above and a compartment having a cavity adapted to receive the subsea electronic assembly is also provided. The compartment may be the subunit compartment.

[0024] In at least some examples, the subsea electronic module is used in subsea oil and gas equipment, such as part of a subsea well. In other examples, the subsea electronic module is used in a subsea power installation, such as for a wind turbine or tidal generator. At least some examples include application in one or more of: CO2 storage, subsea electrification / substations, offshore hydrogen production or similar. It will be appreciated that the subsea electronic module can be used in any subsea application where electronic components need to be provided in a compartment to be protected against environmental conditions.

[0025] In at least some examples, the compartment portion is elongated and the cavity comprises a side wall, a closed end, and an open end. In the expanded position, the subset of electronic components may be in contact with the side wall. Consequently, in the retracted position, the underwater electronic component assembly may be moved into the compartment cavity and then, Petition 870250100808, dated 04 / 11 / 2025, page 21 / 44 14 / 31 The subset of electronic components is moved to the expanded position where it comes into contact with the side wall of the compartment.

[0026] A method of assembling an underwater electronic assembly is also provided, such as the underwater electronic assembly of any example, embodiment, aspect or claim herein. The method may comprise assembling the underwater electronic assembly in a cavity of a subunit. The method may comprise sealing the subunit into the main body of the apparatus described herein. The method may comprise assembling the subunit into the main body on the surface, before submerging the apparatus. The method may comprise fluidly connecting the subunit to the main body. The method may comprise providing a pressure compensator. The method may comprise providing a fluid, such as an inert fluid (e.g., electrically and / or thermally insulating oil) into a chamber or cavity in which the electronic components are housed.The method may comprise supplying the pressure compensator in one subunit, such as a second subunit. The pressure compensating subunit and the electronic subunits may be connected in a sealed manner to the main body, so that a continuous internal fluid volume is defined within the apparatus, extending through the main body and its respective subunits. Consequently, the method may comprise supplying a single fluid volume through the main body and the subunits. The single fluid volume may vary in absolute volume, such as with the external pressure outside the apparatus; or a pressure differential between the fluid inside the apparatus and a fluid external to the apparatus. The method may comprise supplying fluid from one part of the apparatus to another.For example, the method may involve the transfer of fluid between a subunit comprising the pressure compensator and the main body and / or a subunit comprising the electronic module.

[0027] According to one aspect, an electronic device is provided. Petition 870250100808, dated 04 / 11 / 2025, page 22 / 44 15 / 31 submarine, the underwater electronic apparatus comprising; an electronic module housed in a portion of a compartment; a main body to which the electronic module is attached or mounted, the main body comprising a connector portion for housing connectors and further comprising a non-connector portion configured to be devoid of connectors, wherein the main body comprises a reduced profile in the non-connector portion.

[0028] The non-connecting portion may define an auxiliary access portion for a tool, ROV or similar to access a locking portion of the main body to lock and / or unlock the underwater electronic device on the mounting base.

[0029] The main body may comprise an external compartment. The external compartment may define and separate an exterior of the device from an interior of the device.

[0030] The reduced profile or dimension contributes to a reduced total or overall volume of the main body 14, such as an internal or fluid volume of the main body 14. For example, the apparatus 10 shown may have a weight in air of less than 300 kg and a weight in water of less than 200 kg; in contrast to prior art PCGMs, where a comparable apparatus could weigh nearly 400 kg in air and nearly 300 kg in water.

[0031] According to one aspect, an underwater electronic apparatus is provided, the underwater electronic apparatus comprising; an electronic module housed in a portion of a compartment; a main body to which the electronic module is attached or mounted; wherein the compartment portion of the electronic module defines a protrusion of the subsea electronic apparatus; the protrusion is configured to act as a guide post to guide the subsea electronic apparatus during the subsea installation of the subsea electronic apparatus.

[0032] According to one aspect, an underwater electronic system is provided, as described above or elsewhere in this disclosure; and a Petition 870250100808, dated 04 / 11 / 2025, page 23 / 44 16 / 31 mounting base configured to receive the underwater electronic device.

[0033] In at least one example, a system is provided that comprises: An underwater electronic apparatus, the underwater electronic apparatus comprising a first module, the first module being an electronic module housed in a portion of a compartment that defines a first protrusion of the underwater electronic apparatus; the underwater electronic apparatus comprising a second module, the second module being housed in a second portion of a compartment that defines a second protrusion of the underwater electronic apparatus; and a mounting base configured to receive the underwater electronic apparatus, the mounting base comprising at least one recess to receive the first protrusion of the underwater electronic apparatus.

[0034] The electronic module may comprise a power and communications gateway module. The second module may comprise a pressure compensator. Alternatively, the second module may comprise a second electronic module. The first protrusion may define a first guide post to guide the subsea electronic apparatus during the subsea installation of the subsea electronic apparatus, the subsea installation process comprising mounting the subsea electronic apparatus on the previously positioned mounting base. The recess may be defined by an opening, such as a through hole, to receive the first protrusion.The mounting base may comprise a second recess to receive the second protrusion of the underwater electronic device; so that the system, when mounted, comprises the first protrusion of the underwater electronic device received in the first recess of the mounting base and the second protrusion of the underwater electronic device received in the second recess of the mounting base. Each recess may be dimensioned to receive a larger or larger protrusion, such as a protrusion with a larger or larger diameter relative to other protrusions. The underwater electronic device. Petition 870250100808, dated 04 / 11 / 2025, page 24 / 44 17 / 31 may comprise a main body in which the first and second modules are mounted in a sealed manner, the main body further comprising a connector portion for housing connectors and a non-connector portion configured to be devoid of connectors, wherein the main body comprises a reduced profile in the non-connector portion. The non-connector portion may define an auxiliary access portion for a tool, ROV or similar to access a locking portion of the main body to lock and / or unlock the subsea electronic device on the mounting base.

[0035] In at least some instances, the subsea electronic system is used in subsea oil and gas equipment, such as part of a subsea well. In other instances, the subsea electronic apparatus is used in a subsea power installation, such as for a wind turbine or tidal generator.

[0036] According to one aspect, an underwater electronic system is provided comprising: An underwater electronic apparatus, the underwater electronic apparatus comprising an electronic module housed in a compartment portion; and a main body to which the electronic module is attached or mounted; with the compartment portion of the electronic module defining a protrusion of the underwater electronic apparatus; the protrusion defining a guide post for guiding the underwater electronic apparatus during underwater installation of the underwater electronic apparatus; and a mounting base configured to receive the underwater electronic apparatus, the mounting base comprising at least one recess for receiving the first protrusion of the underwater electronic apparatus.

[0037] According to one aspect, a method is provided for installing a submarine electronic system in a submarine location. In at least one example, a method of installing a submarine electronic system in a submarine location may be provided, the method comprising mounting a submarine electronic apparatus on a submarine mounting base, Petition 870250100808, dated 04 / 11 / 2025, page 25 / 44 18 / 31 wherein the underwater electronic apparatus comprises a first module, the first module being an electronic module housed in a portion of a compartment that defines a first protrusion of the underwater electronic apparatus; and a second module, the second module being housed in a second portion of a compartment that defines a second protrusion of the underwater electronic apparatus; and wherein the method comprises receiving the underwater electronic apparatus on the mounting base, the mounting base comprising at least one recess to receive the first protrusion of the underwater electronic apparatus.

[0038] The first projection may comprise a container and the first recess may be defined by an opening, such that the method comprises receiving the container through the opening.

[0039] The method may comprise using the first protrusion as a first guide post to guide the underwater electronic apparatus during the underwater installation of the underwater electronic apparatus, the underwater installation comprising mounting the underwater electronic apparatus on the previously positioned mounting base.

[0040] The method may comprise locking and / or unlocking the apparatus on the mounting base, the apparatus comprising a non-connecting portion defining an auxiliary access portion for a tool, ROV or similar to access a locking portion to lock and / or unlock the underwater electronic apparatus on the mounting base.

[0041] According to one aspect, a method of using the system is provided, such as comprising the underwater electronic apparatus, according to one aspect, claim, embodiment or example of this disclosure.

[0042] The steps of the method can be in any order.

[0043] According to an aspect of, an apparatus is provided configured to perform a method according to an aspect, claim, embodiment or example of this disclosure. Petition 870250100808, dated 04 / 11 / 2025, p. 26 / 44 19 / 31

[0044] Within the scope of this disclosure, it is expressly intended that the various aspects, embodiments, examples and alternatives set forth in the preceding paragraphs, in the claims and / or in the following description and drawings, and in particular in their individual features, may be taken independently or in any combination. That is, all embodiments and / or features of any embodiment may be combined in any manner and / or combination, unless such features are incompatible. The applicant reserves the right to amend any claim originally submitted or to submit any new claim accordingly, including the right to amend any claim originally submitted to depend on and / or incorporate any feature of any other claim, even if not originally claimed in that manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0045] The embodiments of the invention are further described below with reference to the accompanying figures, in which: FIG. 1 shows an underwater electronic device; FIG. 2 shows the underwater electronic device of FIG. 1, forming an underwater electronic system with a mounting base; FIG. 3 shows an exploded view of the underwater electronic apparatus of FIG. 1; and Figures 4a, 4b, and 4c show an example of a sequential installation or assembly of the underwater electronic device of Figure 1 on the mounting base shown in Figure 2; and FIG. 5 shows an example of an associated method. DETAILED DESCRIPTION

[0046] Referring first to Figure 1, an underwater electronic apparatus 10 is shown according to a first example. Here, the apparatus 10 comprises an underwater electronic control apparatus 10, with a power and communications gateway module 16. The apparatus 10 comprises Petition 870250100808, dated 04 / 11 / 2025, page 27 / 44 20 / 31 a main body 14 with an external compartment 15 defining and separating an exterior of the apparatus 10 from an interior of the apparatus 10. The apparatus 10 comprises at least one subunit, shown here with two subunits: with the first module 16 and a second module 18. The first module 16 here comprises the power and communications gateway module 16. Here, the apparatus 10 comprises an assembly of the main body 14 and the two subunits, first and second modules 16, 18, as also shown in the exploded view of Figure 3. When assembled, the apparatus 10 comprises the main body 14 with the modules 16, 18 mounted and fixed to the main body 14. It will be appreciated that the subunits are mounted or fixed to the main body 14 before locating the submarine, such as assembled on the surface or at the manufacturing site (e.g., before submerging in fluid, such as water).

[0047] Apparatus 10 is configured for at least two subunits, with the main body 14 configured to comprise or receive at least modules 16, 18. Herein, apparatus 10 comprises the main body 14 and at least two subunits, shown here as the two modules 16, 18. Each subunit comprises a portion of external compartment, so that the exterior of apparatus 10 is defined by a combination of the main body 14 and the modules 16, 18. The modules 16, 18, when assembled with the main body 14, each define a projection of the main body 14. Each subunit is effectively a respective projection of the main body 14.As shown here in Figures 1 to 4, the underwater electronic apparatus 10 comprises the first module 16, the first module 16 being the power and communications gateway module 16, housed in a compartment portion that defines a first protrusion of the underwater electronic apparatus 10; the underwater electronic apparatus 10 comprising the second module 16, the second module 16 being housed in a second compartment portion that defines a second protrusion of the underwater electronic apparatus 10.

[0048] Therefore, an electronic control device is provided. Petition 870250100808, dated 04 / 11 / 2025, page 28 / 44 21 / 31 submarine 10 comprising: the main body 14 with the compartment defining a portion of the exterior of the apparatus 10; the main body 14 being configured to support at least two subunits thereon; and at least one subunit, herein the subunit comprising the power and communications control module 16.

[0049] In the example shown herein, the apparatus 10 comprises an oil-filled pressure compensator 20. The pressure compensator 20 comprises a flexible element in the form of an inflatable molding chamber 22 herein, such that an internal volume of the pressure compensator 20 is variable in response to a pressure differential between the inside of the pressure compensator 20 and the outside of the pressure compensator 20. The inflatable molding chamber 22 comprises an external surface or portion that is in fluid contact with a fluid external to the apparatus 10, such as water, in which the apparatus 10 is submerged in use. The inflatable molding chamber 22 comprises an internal portion, the internal portion defining a fluid chamber sealed from the outside of the inflatable molding chamber 22. The internal portion comprises an internal fluid. Therefore, the apparatus 10 comprises an inert fluid surrounding the electronic components and other internal components.The internal fluid comprises an insulating fluid (e.g., electrically and / or thermally), so that the apparatus 10 is sealed to generally prevent the entry of external material, such as external fluid (e.g., seawater or similar) and / or contaminants. It will be appreciated that the internal fluid is in fluid communication with other parts of the apparatus 10, such as the interior of the main body 14 and the first module 16.

[0050] Here, the subunit comprising the power and communications control module 16 is a first subunit; and the second subunit is the second module 18 comprising the pressure compensator 20. The first and second modules 16, 18 are arranged side by side, horizontally positioned relative to each other. The first and second modules 16, 18 are located spaced so that the apparatus 10 is balanced, such Petition 870250100808, dated 04 / 11 / 2025, page 29 / 44 22 / 31 as in terms of weight, mass, volume, buoyancy, etc. Here, the first and second modules 16, 18 are located on a respective half or side of the main body 14. The modules 16, 18 are spaced at a relative distance from a center of the main body 14 to provide a balanced apparatus 10. Here, a larger and relatively heavier first module 16 is located relatively closer to the center of the main body 14 compared to a smaller and relatively lighter second module 18, which is located relatively closer to the periphery of the main body 14 than the first module 16. Therefore, the subunits are positioned to provide a balanced apparatus 10, such as with buoyancy where the apparatus 10 is horizontal and where a center of buoyancy corresponds to a center, such as a geometric center or centerline, of the apparatus 10.

[0051] In other examples, the second module 18 comprises a second electronic module. For example, in some embodiments, the second module 18 comprises a second power and communications module. In other examples, the module 18 comprising the pressure compensator may also comprise electronic components. Similarly, in other embodiments, the main body 14 is configured for at least three subunits (for example, the device 10 comprises two electronic modules in the respective subunits and the pressure compensator in the third subunit). The three subunits may be located spaced in a triangular arrangement in the main body 14. The proportions of the triangle, such as side lengths and internal angles, could be dependent on the respective relative properties of each of the subunits.For example, a corner of the triangle might be closer to the center for a larger or heavier subunit compared to a corner for a relatively smaller or lighter subunit.

[0052] As visible in the exploded view shown in Figure 3, each module 16, 18 defines a body portion, the body portion being additional to the main body 14. The body portion comprises a body portion at least Petition 870250100808, dated 04 / 11 / 2025, pages 30 / 44 23 / 31 partially hollow. Therefore, the apparatus 10 comprises the main body 14 and the body portions 16,18 of the module defining an internal housing. The main body 14 comprises an internal cavity that is sealed from or against the exterior of the main body 14; and each body portion in each module 16,18 comprises a body portion cavity. The body portion cavities are sealed from or against an exterior of the body portion (i.e., the exterior of the respective modules 16, 18). The cavities of the body portion of modules 16, 18 are fluidly connected to the main body cavity 14. Consequently, the apparatus 10 comprises at least one internal cavity, sealed from or against an exterior of the apparatus 10, so that components can be housed in the apparatus 10 and protected in a sealed manner from the exterior of the apparatus 10. The main body 14 is in fluid communication with modules 16, 18.Modules 16 and 18 are oriented vertically here, each provided as a cylindrical container with its longitudinal axis aligned vertically. The cylindrical container is closed at its lower end, the closed end being distal to the main body 14. The cylindrical container is open at its upper end, the open end being for sealing connection to the main body 14. The open end provides communication and transfer between modules 16 and 18 and the main body 14. Here, the open end of the second module 18 provides fluid communication and fluid transfer between the main body 14 and the second module 18, such as internal fluid for pressure compensation.Additionally, besides being open for fluid transfer for pressure compensation, the open end of the first module 16 is open for the transfer or communication of signals, such as power and / or control signals, between the subunit and the main body 14.

[0053] Here, the device 10 comprises a universal main body 14, the universal main body 14 being a single configuration for multiple different functionalities or applications. Here, the same type of universal main body 14 is suitable for use with a variety of different types and / or Petition 870250100808, dated 04 / 11 / 2025, page 31 / 44 24 / 31 subunit compositions. For example, the same main body 14 can be used with the two modules 16, 18 shown or with different module configurations, such as with two electronic modules (for example, similar to the first module 16 shown here); or with only a single module (for example, with the second module 18 with the pressure compensator 20).

[0054] The main body 14, as shown in Figure 3, is composed of at least two compartment portions 14a, 14b. A connector portion 44 is shown here in an upper compartment portion 14b. The lower compartment portion 14b effectively defines a compartment base plate, on which one or more modules 16, 18 can be mounted. As described above, compartment 14 can be adapted to balance the apparatus 10. For example, here the compartment base plate 14b is oversized to provide additional weight to the overall apparatus 10. Providing the additional weight in the lower compartment portion 14b can help define a center of gravity / buoyancy of the apparatus 10. For example, providing extra weight in the compartment base plate 14b can effectively act as ballast to increase the overall mass / weight and decrease the center of gravity / buoyancy in the apparatus 10.Here, the base plate of compartment 14b is asymmetrical, being oversized in one half for the second module 18. The second module 18 shown here is smaller, of lower mass and displacement than the first module 16. Consequently, the asymmetrical and oversized base plate 14b balances the apparatus 10 by compensating for the first module 16 being relatively larger / heavier in relation to the second module 18 with an increased mass in compartment 14 on the side for the second module 18 (relative to the side of compartment 14 for the first module 16).

[0055] The device 10 shown here is configured to mount on a mounting base 12, as shown in Figures 2 and 4. Here, base 12 is a submarine base that can be associated with submarine equipment, such as a Petition 870250100808, dated 04 / 11 / 2025, pages 32 / 44 25 / 31 Subsea infrastructure or installation. Generally, the mounting base 12 is located or positioned subsea prior to the mounting of the device 10. For example, the mounting base 12 is incorporated into or attached to the equipment or installation located subsea prior to the installation of the subsea electronic device 10. The mounting base 12 is configured to receive the device 10, with the mounting base 12 configured to assist in the alignment and / or orientation of the device 10 during mounting on the mounting base 12. Here, the mounting base 12 comprises two openings 30, 32 to receive each module 16, 18. The mounting base 12 and the device 10 are configured in such a way that at least one of the modules 16, 18 effectively functions as a guide post to align and / or orient the device 10 during the mounting of the device 10 on the mounting base 12.Here, as shown sequentially in Figures 4a, 4b and 4c, both modules 16 and 18 are used as respective guide posts, functioning as sequential guide posts, where the first, longer, more downward-extending module 16 functions as a first guide post for initial location and / or centering of the device 10 as it is moved to or into the mounting base 12; and the second, shorter, less downward-extending module 18 is used as a second guide post after the first module 16 has been at least partially extended to or through the mounting base 12.

[0056] The main body 14 comprises multiple connectors 40. Here, where the device 10 comprises a power and communications gateway module 16, the main body 14 comprises multiple connectors 40 for transmitting power and / or control signals. Here, the main body 14 comprises all the external connectors of the device 40. The main body 14 comprises a hollow body, defining an internal volume distinct from an external volume of the main body 14, with the internal volume sealed from or against the exterior of the body 14. Each connector 40 allows lines or cables to effectively pass signals into the interior of the main body 14, so as to facilitate the transmission of power and / or communication signals into and / or out. Petition 870250100808, dated 04 / 11 / 2025, pages 33 / 44 26 / 31 from the interior of the main body 14 (and to the first connected module 16). The apparatus 10 comprises a terminal or node, such as an end node, for each line or cable. Another terminal or node of each line or cable (not shown) is located distal to the apparatus 10. Here, each line or cable is for transferring power and / or communication signals between the apparatus 10 and another external apparatus and / or equipment (not shown), such as a remote power and / or communications unit - and / or one or more underwater actuators or devices.

[0057] The main body 14 comprises the connector portion 44 for housing connectors 40; a non-connector portion 50, configured to be devoid of connectors 40. The main body 14 comprises a reduced profile or dimension in the non-connector portion 50. The reduced profile is achievable where it is not necessary for connector lengths 40 to be internally housed within the main body 14 (for example, corresponding to where no connector 40 is located, or areas or portions where no connector 40 is located). The main body 14 comprises an increased profile or dimension in the connector portion 44, relative to a corresponding profile or dimension in the non-connector portion 50. The reduced profile or dimension contributes to a reduced total or overall volume of the main body 14, such as an internal or fluid volume of the main body 14.For example, the device 10 shown may have a weight in air of less than 300 kg and a weight in water of less than 200 kg; in contrast to prior art PCGMs, where a comparable device could weigh nearly 400 kg in air and nearly 300 kg in water. Providing a reduced overall weight can aid a number of processes, such as transport and installation. The reduced volume is relative to a corresponding main body 14 or device 10, where a uniform or equal profile or thickness would be maintained corresponding to that used or required for the connector portion 44.

[0058] Here, the main body 14 comprises the connector portion 44 and an auxiliary access portion defined by the non-connector portion 50. The connector portion 44 is discrete from the auxiliary access portion 50. The auxiliary access portion 50 is for an auxiliary tool or device 10 to access the body. Petition 870250100808, dated 04 / 11 / 2025, pages 34 / 44 27 / 31 main body 14 or device 10. Here, the auxiliary access portion 50 is configured to provide access for a tool or ROV, such as for engagement with a locking mechanism 52. Here, the main body 14 comprises a thicker portion to accommodate the connectors and a relatively thinner portion. The relatively thinner portion assists in providing access, such as for a tool or device 10 (e.g., a gripper, ROV, or other tool) to grip, manipulate, or otherwise mechanically interact with the main body 14 and / or locking mechanism 52. Furthermore, the relatively thinner portion provides a reduced interior volume of the main body 14 (e.g., compared with an equivalent main body 14 whereby a dimension, such as thickness, is uniform for the connector portion and the non-connector portion). The locking mechanism 52 is for locking the main body 14 onto the base 12.The locking mechanism 52 is comprised herein in a central portion of the apparatus. The locking portion is to receive a locking mechanism. Herein, the locking portion comprises the locking mechanism. The locking mechanism is for locking the apparatus 10 onto the mounting base 12. The locking mechanism 52 is located on or adjacent to the auxiliary access portion 50.

[0059] Here, apparatus 10 comprises an oil-filled pressure-balanced optical connector 40a. The optical connector 40a comprises a tubing 41, which is oversized herein, such as overlapping. Here, the tubing 41 is longer than strictly necessary to provide the optical connection, the tubing 41 accommodating fluid - with the oversized tubing 41 providing a fluid reservoir, such as for pressure balancing. The fluid reservoir is enlarged by providing the increased length of tubing 41, the increased length of tubing 41 being relative to that of a length collinear with the connector 40a. Here, the optical connector 40a comprises a length of tubing 41 not collinear with a connecting axis. The tubing 41, as at least Petition 870250100808, dated 04 / 11 / 2025, pages 35 / 44 28 / 31 oversized portion, is located on or within the main body 14, wrapped, coiled or otherwise extended around or within the main body 14. Connector 40a here is a hydralight type connector or similar.

[0060] It will be appreciated that module 16 comprised in the subunit may be a module 16 with components and / or functionalities similar to those disclosed in WO2022263480 or GB2583711, comprising a power and communications gateway module 16. It will be appreciated that a subsea electronic assembly is provided herein, such as for mounting in a cavity of the housing compartment of the first module. The compartment of module 16 herein is the canister, as shown in the figures. Herein, the subsea electronic system 2 is used in subsea oil and gas equipment, as part of a subsea well. In other examples, the subsea electronic system 2 is used in a subsea power installation, such as for a wind turbine or tidal generator. It will be appreciated that the subsea electronic apparatus 10 is used in any subsea application where the electronic components need to be provided in a compartment to be protected against environmental conditions.

[0061] As shown in Figure 5, a method 60 for assembling the underwater electronic assembly 2 is provided. The main body 14 of the apparatus 10 is provided in a first step 62. To which the first subunit 16 is provided in a second step 64. An optional third step 66 links the arrangement of the second subunit 18. Here, the method comprises assembling the underwater electronic assembly in a cavity of a subunit. The method comprises assembling the subunit 16 in a sealed manner onto the main body 14 of the apparatus 10. The method comprises assembling the subunit 16 onto the main body 14 on the surface, before submerging the apparatus 10. The method comprises fluidly connecting the subunit to the main body 14.

[0062] Therefore, a method is provided for installing a submarine electronic system 2 in a submarine location. In at least one Petition 870250100808, dated 04 / 11 / 2025, pages 36 / 44 29 / 31 example, a method is provided for installing the underwater electronic system 2 in an underwater location, the method comprising mounting the underwater electronic apparatus 10 on the underwater mounting base 12, wherein the underwater electronic apparatus 10 comprises the first module 16, the first module 16 being the electronic module 16 housed in the compartment portion that defines the first protrusion of the underwater electronic apparatus 10; and the second module 16, the second module 16 being housed in the second compartment portion that defines the second protrusion of the underwater electronic apparatus 10; and wherein the method comprises receiving the underwater electronic apparatus 10 on the mounting base 12, the mounting base 12 comprising at least one recess to receive the first protrusion of the underwater electronic apparatus 10.The first protrusion here comprises the container, and the first recess is defined by the opening 30, such that the method comprises receiving the container through the opening 30. As shown in Figures 4a, 4b, and 4c sequentially, the method herein comprises using the first protrusion as a first guide post to guide the subsea electronic device 10 during the subsea installation of the subsea electronic device 10, the subsea installation comprising mounting the subsea electronic device 10 on the previously positioned mounting base 12. The method comprises locking and / or unlocking the device 10 on the mounting base 12, the device 10 comprising the non-connecting portion 50 defining an auxiliary access portion for a tool, ROV, or similar to access the locking mechanism 52 to lock and / or unlock the subsea electronic device 10 on the mounting base 12.

[0063] Throughout the description and claims of this descriptive report, the words comprise and contain and variations thereof mean including, but not limited to, and they are not intended to (and do not) exclude other components, whole numbers, or steps. Throughout the description and claims of this descriptive report, the singular encompasses the plural unless the context requires otherwise. In particular, when the indefinite article is used, the descriptive report should be understood as encompassing the Petition 870250100808, dated 04 / 11 / 2025, pp. 37 / 44 30 / 31 plurality, as well as singularity, unless the context requires otherwise.

[0064] All features disclosed in this descriptive report (including any attached claims, abstract and drawings), and / or all steps of any method or process so disclosed, may be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive. The applicant indicates that aspects of this disclosure may consist of any single feature or combination of features. It should be understood that the embodiments described herein are merely illustrative and that various modifications may be made without departing from the scope of the disclosure. For example, it will be appreciated that, although shown here with two subunits, other examples comprise additional ports to receive additional subunits; and examples are contemplated where three, four or more subunits are provided in the main body of the apparatus.It will be appreciated if the mounting base can be provided with a corresponding number of openings to receive the subunits. Alternatively, the mounting base may comprise fewer openings, such as where only a limited number of the subunits are received on the mounting base (for example, where the subunits act as a guide post). In still other examples, the mounting base may comprise more openings than the subunits provided in the device. For example, a single universal mounting base may be configured for use with devices comprising different numbers and / or sizes of modules or subunits from each other. Each feature disclosed in this descriptive report (including any attached claims, abstract and drawings) may be replaced by alternative features serving the same, equivalent or similar purpose, unless expressly indicated otherwise.Therefore, unless expressly stated otherwise, each disclosed feature is only an example of a generic series of equivalent or similar features. The invention does not... Petition 870250100808, dated 04 / 11 / 2025, pp. 38 / 44 31 / 31 restricts the details of any of the foregoing embodiments. The invention extends to any novel, or any novel combination of, the features disclosed in this descriptive report (including any appended claims, abstract and drawings), or to any novel, or any novel combination of, the steps of any method or process disclosed herein. The claims should not be interpreted as covering only the foregoing embodiments, but also any embodiments that fall within the scope of the claims, including those equivalent. Petition 870250100808, dated 04 / 11 / 2025, pp. 39 / 44

Claims

1 / 4 CLAIMS 1. Submarine electronic system, the system characterized by comprising: a submarine electronic apparatus comprising: a first module, the first module being an electronic module housed in a portion of a compartment that defines a first protrusion of the submarine electronic apparatus; a second module, the second module being housed in a second portion of a compartment that defines a second protrusion of the submarine electronic apparatus;and a mounting base configured to receive the underwater electronic device, the mounting base comprising a first recess to receive the first protrusion of the underwater electronic device and a second recess to receive the second protrusion of the underwater electronic device, wherein the first protrusion defines a first guide post to guide the underwater electronic device during the underwater installation of the underwater electronic device, the underwater installation process comprising mounting the underwater electronic device on the previously positioned mounting base; wherein the system, when mounted, comprises the first protrusion of the underwater electronic device received in the first recess of the mounting base and the second protrusion of the underwater electronic device received in the second recess of the mounting base.

2. Submarine electronic system, according to claim 1, characterized in that the electronic module comprises a power and communications gateway module; or in that the second module comprises a pressure compensator and, optionally, in that the electronic module comprises a power and communications gateway module; or in that the second module comprises a second electronic module and, Petition 870250079602, dated 05 / 09 / 2025, page 22 / 31 2 / 4 optionally, in that the electronic module comprises a power and communications gateway module.

3. Submarine electronic system, according to any of the preceding claims, characterized in that the recess is defined by an opening, such as a passage hole, to receive the first protrusion.

4. Submarine electronic system, according to any of the preceding claims, characterized in that each recess is dimensioned to receive a larger or larger protrusion, such as a protrusion with a larger or larger diameter relative to other protrusion(s).

5. Submarine electronic system, according to any of the preceding claims, characterized in that the submarine electronic apparatus comprises a main body in which the first and second modules are mounted in a sealed manner, the main body further comprising a connector portion for housing connectors and a non-connector portion, wherein the main body comprises a reduced profile in the non-connector portion.

6. Submarine electronic system, according to claim 5, characterized in that the non-connecting portion defines an auxiliary access portion for a tool, ROV or similar to access a locking portion of the main body to lock and / or unlock the submarine electronic apparatus on the mounting base.

7. Submarine electronic apparatus, the submarine electronic apparatus characterized by the fact that it comprises: a first module, the first module being an electronic module housed in a portion of a compartment that defines a first protrusion of the submarine electronic apparatus; a second module, the second module being housed in a second portion of a compartment that defines a second protrusion of the submarine electronic apparatus; Petition 870250079602, dated 05 / 09 / 2025, p.23 / 31 3 / 4 wherein the first protrusion defines a first guide post to guide the subsea electronic device during the subsea installation of the subsea electronic device, the subsea installation process comprising mounting the subsea electronic device on the previously positioned mounting base; wherein the previously positioned mounting base comprises a first opening configured to receive the first protrusion of the subsea electronic device and a second opening configured to receive the second protrusion of the subsea electronic device.

8. Submarine electronic apparatus, according to claim 7, characterized in that the electronic module comprises a power and communications gateway module; or in that the second module comprises a pressure compensator and, optionally, in that the electronic module comprises a power and communications gateway module; or in that the second module comprises a second electronic module and, optionally, in that the electronic module comprises a power and communications gateway module.

9. Submarine electronic apparatus, according to any one of claims 7 to 8, characterized in that the submarine electronic apparatus comprises a main body in which the first and second modules are mounted in a sealed manner, the main body further comprising a connector portion for housing connectors and a non-connector portion, wherein the main body comprises a reduced profile in the non-connector portion.

10. Submarine electronic apparatus, according to claim 9, characterized in that the non-connecting portion defines an auxiliary access portion for a tool, ROV or similar to access a locking portion of the main body to lock and / or unlock the submarine electronic apparatus on the mounting base. Petition 870250079602, dated 05 / 09 / 2025, p. 24 / 31 4 / 4 11. Method for installing a submarine electronic system in a submarine location, the method characterized in that it comprises mounting a submarine electronic apparatus on a submarine mounting base, wherein the submarine electronic apparatus comprises a first module, the first module being an electronic module housed in a compartment portion that defines a first protrusion of the submarine electronic apparatus; and a second module, the second module being housed in a second compartment portion that defines a second protrusion of the submarine electronic apparatus; receiving the submarine electronic apparatus on the mounting base, the mounting base comprising at least one recess to receive the first protrusion of the submarine electronic apparatus;and to lock and / or unlock the device on the mounting base, the device comprising a non-connecting portion defining an auxiliary access portion for a tool, ROV or similar to access a locking portion to lock and / or unlock the underwater electronic device on the mounting base.

12. Method, according to claim 11, characterized in that the first protrusion comprises a container and the first recess is defined by an opening, such that the method comprises receiving the container through the opening; or wherein the method comprises using the first protrusion as a first guide post to guide the subsea electronic apparatus during the subsea installation of the subsea electronic apparatus, the subsea installation comprising mounting the subsea electronic apparatus on the previously positioned mounting base. Petition 870250079602, dated 05 / 09 / 2025, pp. 25 / 31

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