Construction method and construction system of a submarine data center

Abstract

The present application relates to the technical field of ocean engineering, and discloses a construction method and a construction system of a submarine data center, the submarine data center comprising a data center shore station, a main submarine cable, a submarine substation, a sub-submarine cable and a submarine data cabin, and comprising the following steps: constructing the data center shore station; transporting the submarine substation to an installation site, connecting the data center shore station and the submarine substation through the main submarine cable; laying the main submarine cable below the sea surface, and hoisting and lowering the submarine substation to a first preset position; transporting the submarine data cabin to the installation site, connecting the submarine substation and the submarine data cabin through the sub-submarine cable; laying the sub-submarine cable below the sea surface, and hoisting and lowering the submarine data cabin to a second preset position. Through the above steps, the looping, twisting and excessive bending of the submarine cable during hoisting are effectively avoided, the optical and electrical transmission performance is ensured, the waiting time of the ship is reduced, and the utilization rate of the window period is improved.

Description

Technical Field

[0001] This invention relates to the field of marine engineering technology, and specifically to a construction method and system for a subsea data center. Background Technology

[0002] With the increasing demand for data processing, subsea data centers have emerged as a new type of low-energy, high-reliability infrastructure. Subsea data centers typically consist of underwater structures such as subsea substations, data modules, and foundations, as well as submarine fiber optic cables connecting these structures. Compared to traditional marine engineering projects where underwater structures are primarily steel, subsea data centers contain more electrical and network equipment. Their electronic components are highly precise, requiring stricter control over levelness and vibration during installation. Furthermore, to ensure the underwater airtightness of the hull, the fiber optic cables must be pre-connected to the data module or subsea substation.

[0003] However, underwater structures need to be connected to submarine cables at sea and lowered with the cables in place. Traditional hoisting methods can easily cause the submarine cables to loop, twist, or have too small a bending radius, resulting in damage. Summary of the Invention

[0004] In view of this, the present invention provides a construction method and system for a submarine data center to solve the problem that traditional hoisting methods can easily cause damage to submarine cables due to looping, twisting, or excessively small bending radii when submarine structures need to be connected to submarine cables at sea and lowered with the cables.

[0005] In a first aspect, the present invention provides a construction method for a submarine data center, the submarine data center comprising: a data center shore station, a main submarine cable, a submarine substation, a subsea cable, and a submarine data cabin; Includes the following steps: Construct the data center shore station; transport the submarine substation to the installation site and connect the data center shore station and the submarine substation via the main submarine cable; lay the main submarine cable below the sea surface and hoist the submarine substation to a first preset position; transport the submarine data cabin to the installation site and connect the submarine substation and the submarine data cabin via the branch submarine cable; lay the branch submarine cable below the sea surface and hoist the submarine data cabin to a second preset position.

[0006] Beneficial effects: The cable-driven hoisting process, which involves placing the connectors first and then the main body, effectively avoids looping, twisting, and excessive bending of the submarine cable during hoisting, ensuring the performance of photoelectric transmission. The optimized deployment sequence and the use of different methods such as barge transport or stern hoisting for different structures reduced vessel waiting time and improved window utilization.

[0007] In one optional implementation, the main submarine cable includes a first main submarine cable segment and a second main submarine cable segment; After constructing the data center shore station, the following steps are also included: installing one end of the first main submarine cable segment on the data center shore station, and sealing and pre-storing the other end on the seabed; The process of transporting the submarine substation to the installation site and connecting the data center shore station and the submarine substation via the main submarine cable also includes the following steps: connecting one end of the second main submarine cable segment to the submarine substation, and the second main submarine cable segment is wound around the submarine substation as a whole.

[0008] In one optional implementation, the steps of transporting the submarine substation to the installation site and connecting the data center shore station and the submarine substation via the main submarine cable further include the following steps: The first main submarine cable segment, which has been laid and pre-stored on the seabed, is hoisted to the deck of the work vessel and connected to the second main submarine cable segment on the submarine power station for performance testing.

[0009] Beneficial effects: This segmented pre-storage design separates the laying of the data center shore station and near-shore submarine cable sections from the transportation of the submarine substation. The first main submarine cable section can be laid in advance, while the second main submarine cable section is transported along with the submarine substation, avoiding the long-distance and challenging search and traction of cable ends at sea. This method significantly shortens the core offshore operation time for main submarine cable splicing and submarine substation installation, improves construction efficiency, and reduces the risk of project delays due to adverse sea conditions.

[0010] In one optional implementation, the steps of laying the main submarine cable below the sea surface and hoisting and lowering the submarine substation to the first preset position include the following steps: The main submarine cable is hoisted into the water and the work vessel is simultaneously driven to move toward the first preset position on the sea surface; the work vessel moves above the first preset position to lower and install the submarine substation to the first preset position.

[0011] Beneficial effects: The method of lowering the main submarine cable while simultaneously moving the work vessel allows for control over its shape in the water, preventing damage due to excessive bending or excessive tension caused by its own weight. Furthermore, the coordinated lowering of the subsea substation and the main cable ensures that the main cable has sufficient slack length after the substation is in place, preventing any pulling force on the substation. This process guarantees the mechanical safety of the main cable during deployment and achieves precise, one-time placement of the subsea substation.

[0012] In one optional embodiment, the submarine cable includes a first submarine cable segment and a second submarine cable segment; The process of connecting the submarine power station and the submarine data cabin via the submarine cable also includes the following steps: The first subsea cable segment coiled around the submarine power station was pulled out and hoisted to the deck of the work vessel, where it was connected to the second subsea cable segment on the submarine data cabin and its performance was tested.

[0013] Beneficial effects: The pre-connection design of the first and second submarine cable segments further simplifies the offshore construction process.

[0014] In one optional implementation, the subsea data cabin includes a subsea data cabin body and a sinking plate; The steps of laying the submarine cable below the sea surface and hoisting and lowering the seabed data cabin to the second preset position also include the following steps: The anti-sinking plate is lowered and installed in the second preset position; the submarine cable is hoisted into the water and the work vessel is moved above the second preset position at the same time; the seabed data cabin is lowered and installed on the surface of the anti-sinking plate and fixedly connected.

[0015] Beneficial effects: The anti-sinking plate has a large load-bearing area, which can prevent the heavy subsea data cabin from sinking excessively or tilting in soft mud, providing a stable and level mounting base for the subsea data cabin. Through the split installation, the problem of sinking and instability of heavy equipment on complex seabeds is effectively solved, ensuring the attitude safety of the subsea data cabin during long-term operation.

[0016] In one optional implementation, the steps of hoisting the main submarine cable into the water and simultaneously moving the work vessel to above the first preset position and the steps of hoisting the branch submarine cable into the water and simultaneously moving the work vessel to above the second preset position further include the following steps: Control the lowering speed and the speed of the moving work vessel so that the angle when the main submarine cable and / or the branch submarine cable contact the seabed is less than or equal to 18°.

[0017] Beneficial effects: By dynamically adjusting the ship speed and cable laying speed, the contact angle can be controlled within 18°, which can effectively buffer the impact force when the submarine cable hits the seabed, reduce wear, greatly extend the service life of the submarine cable in complex seabed environments, and ensure the long-term power supply and communication reliability of the data center.

[0018] In one optional implementation, the steps of hoisting and lowering the subsea power station to the first preset position and the steps of hoisting and lowering the subsea data module to the second preset position further include the following steps: Positioning beacons and inclinometers are installed on the subsea power station and / or the subsea data module to monitor the underwater position, heading, and inclination of the subsea power station and / or the subsea data module in real time during the lowering process; the working vessel and / or rotating crane are moved and adjusted according to the monitored data to adjust the attitude of the subsea power station and / or the subsea data module.

[0019] Beneficial effects: By installing positioning beacons and inclinometers, combined with DGPS ship positioning, high precision requirements of installation position error ≤1m, heading error ≤2°, and tilt error ≤1° were achieved, ensuring the installation of the subsea power station and the smooth docking of the subsea data cabin with the anti-sinking plate foundation.

[0020] In an optional implementation, the steps of hoisting one end of the first main submarine cable segment that has been laid and pre-stored on the seabed to the deck of the work vessel and pulling out and hoisting the first branch submarine cable segment coiled around the submarine power station to the deck of the work vessel further include the following steps: The crane uses slings to pull out the first main submarine cable segment and / or the first branch submarine cable segment, and the angle between the slings and the horizontal plane during the pulling process is greater than or equal to 60°.

[0021] Beneficial effects: It allows the submarine cable to form a gentle arc at the bending point when lifted, preventing the cable from bending. This effectively prevents damage to the internal optical fibers or cables caused by excessively small bending radii during lifting.

[0022] Secondly, the present invention also provides a construction system applicable to the construction method of the above-mentioned seabed data center, including: a work vessel, a diving support system, a positioning beacon, an inclinometer, and a DGPS positioning and navigation system. Attached Figure Description

[0023] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a flowchart illustrating the construction method of a submarine data center according to an embodiment of the present invention. Figure 2 This is a top view of the layout of the underwater data center according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure for arranging the seabed data cabin according to an embodiment of the present invention; Figure 4 This is a diagram illustrating the structural benefits of laying submarine cables below the sea surface according to an embodiment of the present invention. Explanation of reference numerals in the attached figures: 1. Main submarine cable; 2. Submarine power station; 3. Submarine cable branch; 31. First submarine cable branch segment; 32. Second submarine cable branch segment; 4. Subsea data cabin; 41. Subsea data cabin body; 42. Anti-sinking plate; 5. Workboat. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0026] With the increasing demand for data processing, subsea data centers have emerged as a new type of low-energy, high-reliability infrastructure. Subsea data centers typically consist of underwater structures such as subsea substations, data modules, and foundations, as well as submarine fiber optic cables connecting these structures. Compared to traditional marine engineering projects where underwater structures are primarily steel, subsea data centers contain more electrical and network equipment. Their electronic components are highly precise, requiring stricter control over levelness and vibration during installation. Furthermore, to ensure the underwater airtightness of the hull, the fiber optic cables must be pre-connected to the data module or subsea substation.

[0027] However, underwater structures need to be connected to submarine cables at sea and lowered with the cables in place. Traditional hoisting methods can easily cause the submarine cables to loop, twist, or have too small a bending radius, resulting in damage.

[0028] To solve the above technical problems, the following will be combined with... Figures 1 to 4 The following describes embodiments of the present invention.

[0029] According to an embodiment of the present invention, in one aspect, a construction method for a subsea data center is provided, applicable to the subsea data center in this embodiment.

[0030] like Figure 3 As shown, the submarine data center includes: a data center shore station (not shown in the figure), main submarine cable 1, submarine substation 2, subsea substation cable 3, and submarine data module 4. Main submarine cable 1 includes a first main submarine cable segment (not shown in the figure) and a second main submarine cable segment (not shown in the figure). Subsea substation cable 3 includes a first subsea substation cable segment 31 and a second subsea substation cable segment 32. Subsea data module 4 includes the subsea data module body 41 and a susceptibility plate 42.

[0031] like Figure 1 As shown, the specific steps include: Step S1: Construct a data center shore station. The specific steps are as follows: Select a suitable location on land to build a data center shore station, which will serve as the energy management and monitoring center for the entire system.

[0032] Step S2: Transport the submarine substation 2 to the installation site and connect it to the data center shore station via the main submarine cable 1. The specific steps are as follows: After the data center shore station is built, one end of the first main submarine cable segment is pre-installed on the data center shore station, while the other end is sealed and pre-stored on the seabed, forming the wet storage joint of the main submarine cable 1.

[0033] Meanwhile, before transporting the submarine power station 2 to the installation site, one end of the first submarine cable segment 31 is connected to the submarine power station 2, and the entire first submarine cable segment 31 is orderly wound around the submarine power station 2, for example, the entire first submarine cable segment 31 is coiled in a figure-eight shape on the cable trays on both sides of the submarine power station 2. The other end of the first submarine cable segment 31 that is not connected to the submarine power station 2 is sealed and protected by a towing head, and a lifting lug is reserved on the towing head for subsequent lifting of the first submarine cable segment 31.

[0034] The work vessel 5, carrying the subsea substation 2, is moved to a predetermined position. Divers, working with the crane on the work vessel 5, connect the hook end of the crane's sling to the lug on the end of the first main submarine cable segment. A portion of the first main submarine cable segment is then hoisted onto the deck of the work vessel 5 using a specialized sling. On the deck of the work vessel 5, the first main submarine cable segment is spliced ​​to the second main submarine cable segment already connected to the subsea substation 2, i.e., a joint is fabricated. The completed main submarine cable 1 undergoes insulation and withstand voltage tests to ensure connection quality.

[0035] This segmented pre-storage design separates the laying of the data center shore station and near-shore submarine cable sections from the transportation of the submarine substation 2. The first main submarine cable section can be laid in advance, while the second main submarine cable section is transported together with the submarine substation 2, avoiding the long-distance and challenging search and traction of cable ends at sea. This method significantly shortens the core offshore operation time for the splicing of the main submarine cable 1 and the installation of the submarine substation 2, improves construction efficiency, and reduces the risk of project delays due to adverse sea conditions.

[0036] Step S3: Lay the main submarine cable 1 below the sea surface and hoist and lower the submarine substation 2 to the first preset position. The specific steps are as follows: After the testing and connection of the main submarine cable 1 are completed, the connector of the main submarine cable 1 is first slowly laid to the seabed using a special lifting tool. Then, the work vessel 5 is slowly moved towards the first preset position to lay the remaining main submarine cable 1 on the deck. When the work vessel 5 approaches a suitable position near the first preset position, the submarine substation 2 is hooked up, lifted and slowly lowered into the water and placed on the seabed. During this process, the work vessel 5 continues to be slowly moved towards the first preset position until it moves to above the first preset position. At this point, the submarine substation 2 is smoothly lowered and precisely installed in the first preset position.

[0037] Before hooking the subsea substation 2, positioning beacons and inclinometers need to be installed on the integrated subsea substation 2 and its anti-sinking plate. Preferably, multiple positioning beacons and inclinometers are installed at diagonal positions on the anti-sinking plate of the subsea substation to monitor the subsea substation 2's entry into the water, its underwater position, and its flatness after settling in real time. When it is 1m above the first preset position, the bow direction is adjusted by moving the work vessel and rotating the crane to meet the design requirements before continuing to lower it, so that the substation is accurately placed in the first preset position, thus achieving high-precision installation.

[0038] During the above process, the method of lowering the main submarine cable 1 while moving the work vessel can control its shape in the water, preventing damage due to excessive bending or excessive tension caused by its own weight. At the same time, the lowering of the submarine substation 2 is carried out in coordination with the deployment of the main submarine cable 1, ensuring that the main submarine cable 1 has an appropriate spare length after the submarine substation 2 is in place, so as not to exert a pulling force on the submarine substation 2.

[0039] This process ensured the mechanical safety of the main submarine cable 1 during its deployment and enabled the precise one-time placement of the submarine substation 2.

[0040] During the process of lowering the main submarine cable 1 into the water and moving the work vessel 5, it is necessary to precisely control the lowering speed of the main submarine cable 1 and the speed of the work vessel to ensure that the angle α when the main submarine cable 1 contacts the seabed is less than or equal to 18°. This angle control is accomplished by divers or underwater robots, and by monitoring the state of the cable's contact point with the mud, it is ensured that the bending radius of the main submarine cable 1 meets the requirements.

[0041] The main submarine cable 1 enters the water from the stern or side of the ship to the seabed under the influence of gravity, forming a catenary shape. An excessively large contact angle may cause damage. By dynamically adjusting the ship speed and the cable laying speed, the contact angle can be controlled within 18°, which can effectively buffer the impact force when the main submarine cable 1 hits the seabed, reduce wear, and greatly extend the service life of the main submarine cable 1 in complex seabed environments.

[0042] Step S4: Transport the submarine data capsule 4 to the installation site and connect the submarine substation 2 and the submarine data capsule 4 via the submarine cable 3.

[0043] After the installation of the submarine power station 2 is completed, the work vessel 5 carries the submarine data cabin 4 and moves it to the preset position. Divers connect the crane sling to the reserved lifting lug at the end of the first submarine cable segment 31 of the submarine wind power station. With the assistance of the crane, the first submarine cable segment 31 in the coiled state is pulled out. Then, the first submarine cable segment 31 pulled out is pulled to the deck of the work vessel 5 by the crane and rigging. It is then connected to the second submarine cable segment 32 that is pre-connected to the submarine data cabin 4. That is, the joint is made. The insulation, pressure resistance and other performance tests are carried out on the connected submarine cable 3 to ensure the connection quality.

[0044] The figure-eight coiling method in step S2 facilitates the operation in step S4. Compared with single-loop coiling, it can store a longer submarine cable in a limited space, and the force is more even when laying the cable, making it less prone to kinking. The pre-connection design of the first submarine cable segment 31 and the second submarine cable segment 32 further simplifies the offshore construction procedure.

[0045] Step S5, as follows Figure 3 and Figure 4 As shown, the submarine cable 3 is laid below the sea surface, and the seabed data cabin 4 is hoisted and lowered to the second preset position. Specifically, the following steps are included: Before deployment, the anti-sinking plate 42 is hooked down and installed on the seabed at the second preset position to form a stable base platform.

[0046] When laying the subsea cable 3, a special lifting device is used to slowly lower the connector of the subsea cable 3 to the seabed. The work vessel 5 is then slowly moved towards the second preset position to lay the remaining subsea cable 3 on the deck. When the work vessel 5 approaches a suitable position near the second preset position, the seabed data capsule 4 is hooked up, hoisted, and slowly lowered into the water and placed on the seabed. During this process, the work vessel 5 continues to slowly move towards the second preset position until it is above the second preset position. When the seabed data capsule 4 is lowered to a height of approximately 1 meter above the anti-sinking plate 42, the position of the guide post is observed by divers or an underwater robot. After fine-tuning by moving the work vessel and rotating the crane, the locking pins of the seabed data capsule 4 and the anti-sinking plate 42 are secured, thereby lowering the seabed data capsule body 41 and precisely installing it onto the surface of the anti-sinking plate 42.

[0047] Similar to step S3, before hooking the anti-sinking plate 42 and the seabed data capsule 4 into the water, positioning beacons and inclinometers need to be installed on them to monitor the anti-sinking plate 42 and the seabed data capsule 4 in real time, their underwater position and flatness after they sit on the bottom; by moving the work vessel and rotating the crane to adjust the bow direction, the anti-sinking plate 42 is accurately positioned in the second preset position, and the seabed data capsule 4 can be accurately installed on the anti-sinking plate 42 to prevent tilting during and after installation.

[0048] The anti-sinking plate 42 has a large load-bearing area, which can prevent the heavy seabed data cabin 4 from sinking excessively or tilting in the soft mud, providing a stable and level mounting base for the seabed data cabin 4. Through the split installation, the problem of sinking and instability of heavy equipment on complex seabeds is effectively solved, ensuring the attitude safety of the seabed data cabin 4 during long-term operation.

[0049] Steps S3 and S5, by installing positioning beacons and inclinometers and combining them with DGPS ship positioning, achieved high precision requirements of installation position error ≤1m, heading error ≤2°, and tilt error ≤1°, ensuring the installation of the submarine substation 2 and the smooth docking of the submarine data cabin 4 with the anti-sinking plate 42 foundation.

[0050] Similarly, during the process of hoisting the subsea cable 3 into the water and moving the work vessel 5, it is necessary to precisely control the lowering speed and the speed of moving the work vessel so that the angle α when the subsea cable 3 contacts the seabed is less than or equal to 18°.

[0051] In the process of laying the anti-sinking plate 42, the transport barge is positioned stern-to-stern with the work vessel 5, and the work vessel 5 is used to directly lift the plate.

[0052] Through the aforementioned steps S1-S5, the cable-laying process, which involves placing the connector first, then the main body, and simultaneously moving the work vessel and laying the cable, effectively avoids looping, twisting, and excessive bending of the submarine cable during the hoisting process, ensuring the performance of photoelectric transmission. The deployment sequence was optimized, with the substation first, followed by the anti-sinking plate 42, and then the seabed data cabin 4. Different methods, such as barge transfer or stern hoisting, were used for different structures, reducing vessel waiting time and improving the utilization rate of the window period.

[0053] In one embodiment, when hoisting the pre-stored first main submarine cable segment or the coiled first branch submarine cable segment 31 to the deck of the work vessel 5, the sling used maintains an angle of greater than or equal to 60° with the horizontal plane and a lifting load factor of not less than 2.0 during the pulling process. This allows the submarine cable to form a gentle arc at the bending point of the lift, avoiding bending of the submarine cable. This effectively prevents damage to the internal optical fibers or cables of the submarine cable due to excessively small bending radii during the lifting process.

[0054] In one embodiment, the lifting slings are made of high-performance polyester cables with a safety factor of ≥6, facilitating underwater unhooking by divers. This significantly improves the safety of the entire lifting operation system and effectively reduces the risk of equipment falling, submarine cable damage, or personal injury due to sling failure.

[0055] According to an embodiment of the present invention, in another aspect, a construction system is provided, suitable for realizing the construction method of the aforementioned subsea data center, comprising: a work vessel 5, a diving support system, a positioning beacon, an inclinometer, and a DGPS positioning and navigation system. The work vessel 5 is equipped with a main crane, etc., and has full rotation capability. The diving support system includes, but is not limited to, underwater lighting and camera equipment, and can check the final positioning status of the subsea substation 2 and the subsea data capsule 4, and confirm the contact between the anti-sinking plate 42 and the seabed, etc.

[0056] The functions of the positioning beacon, inclinometer, and DGPS positioning and navigation system are the same as those in the construction method of the submarine data center in the first embodiment, and will not be repeated here.

[0057] The above setup ensures that the entire subsea data center construction method can be implemented efficiently, and the system has all the beneficial effects of the subsea data center construction method.

[0058] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A construction method for an underwater data center, characterized in that, The submarine data center includes: a data center shore station, a main submarine cable (1), a submarine substation (2), a subsea cable (3), and a submarine data cabin (4). Includes the following steps: Construct the data center shore station; transport the submarine substation (2) to the installation site and connect the data center shore station and the submarine substation (2) through the main submarine cable (1); lay the main submarine cable (1) below the sea surface and hoist the submarine substation (2) to the first preset position; transport the submarine data cabin (4) to the installation site and connect the submarine substation (2) and the submarine data cabin (4) through the sub-submarine cable (3); lay the sub-submarine cable (3) below the sea surface and hoist the submarine data cabin (4) to the second preset position.

2. The construction method for the subsea data center according to claim 1, characterized in that, The main submarine cable (1) includes a first main submarine cable segment and a second main submarine cable segment; After constructing the data center shore station, the following steps are also included: installing one end of the first main submarine cable segment on the data center shore station, and sealing and pre-storing the other end on the seabed; Before transporting the submarine substation (2) to the installation site and connecting the data center shore station and the submarine substation (2) through the main submarine cable (1), the following steps are also included: connecting one end of the second main submarine cable segment to the submarine substation (2), and the second main submarine cable segment is wound around the submarine substation (2) as a whole.

3. The construction method for the subsea data center according to claim 2, characterized in that, The process of transporting the submarine substation (2) to the installation site and connecting the data center shore station and the submarine substation (2) via the main submarine cable (1) also includes the following steps: The first main submarine cable segment, which has been laid and pre-stored on the seabed, is hoisted to the deck of the work vessel (5) and connected to the second main submarine cable segment on the submarine substation (2) for performance testing.

4. The construction method for the subsea data center according to claim 2, characterized in that, The steps of laying the main submarine cable (1) below the sea surface and hoisting and lowering the submarine substation (2) to the first preset position include the following steps: The main submarine cable (1) is hoisted into the water and the work vessel (5) is driven to move toward the first preset position on the sea surface at the same time; the work vessel (5) moves above the first preset position to lower and install the submarine substation (2) to the first preset position.

5. The construction method for the subsea data center according to claim 4, characterized in that, The submarine cable (3) includes a first submarine cable segment (31) and a second submarine cable segment (32); The process of connecting the submarine power station (2) and the submarine data cabin (4) via the submarine cable (3) also includes the following steps: The first subsea cable segment (31) coiled around the submarine power station (2) is pulled out and hoisted to the deck of the work vessel (5) and connected to the second subsea cable segment (32) on the submarine data cabin (4) for performance testing.

6. The construction method for the subsea data center according to claim 5, characterized in that, The seabed data cabin (4) includes the seabed data cabin body (41) and the anti-sinking plate (42). The steps of laying the submarine cable (3) below the sea surface and hoisting and lowering the seabed data cabin (4) to the second preset position also include the following steps: The anti-sinking plate (42) is lowered and installed in the second preset position; the submarine cable (3) is hoisted into the water and the work vessel is moved above the second preset position at the same time; the seabed data cabin (4) is lowered and installed on the surface of the anti-sinking plate (42) and fixedly connected.

7. The construction method for the subsea data center according to claim 6, characterized in that, The steps of hoisting the main submarine cable (1) into the water and simultaneously moving the work vessel to above the first preset position and the steps of hoisting the branch submarine cable (3) into the water and simultaneously moving the work vessel to above the second preset position also include the following steps: Control the lowering speed and the speed of the moving work vessel so that the angle when the main submarine cable (1) and / or the branch submarine cable (3) contacts the seabed is less than or equal to 18°.

8. The construction method for a submarine data center according to any one of claims 1-7, characterized in that, The steps of hoisting and lowering the submarine substation (2) to the first preset position and the steps of hoisting and lowering the submarine data module (4) to the second preset position also include the following steps: Positioning beacons and inclinometers are installed on the subsea substation (2) and / or the subsea data cabin (4) to monitor the underwater position, heading and inclination of the subsea substation (2) and / or the subsea data cabin (4) in real time during the lowering process; the working vessel (5) and / or rotating crane are moved according to the monitored data to adjust the attitude of the subsea substation (2) and / or the subsea data cabin (4).

9. The construction method for the subsea data center according to claim 5, characterized in that, The steps of hoisting the first main submarine cable segment, which has been laid and pre-stored on the seabed, to the deck of the work vessel (5) and pulling out and hoisting the first branch submarine cable segment (31) coiled around the submarine power station (2) to the deck of the work vessel (5) also include the following steps: The crane uses slings to pull out the first main submarine cable segment and / or the first branch submarine cable segment (31), and the angle between the slings and the horizontal plane during the pulling process is greater than or equal to 60°.

10. A construction system, characterized in that, The construction method for realizing the submarine data center according to any one of claims 1-9 includes: a work vessel (5), a diving support system, a positioning beacon, an inclinometer, and a DGPS positioning and navigation system.

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