A sealed, fanless compute enclosure for any digital operating platform, new or in service. Its walls form a two-phase heat spreader delivering heat to one dry face clamped to a load-bearing two-phase spine, cold rail or hull, with no dielectric fluid or liquid coupling at the board. Includes a dry gas fill with seal and seating checks gating power, a re-housing kit, a reusable shell and insert, and dry exchange by the legally authorised identity. Also covers every-climate heat rejection, subsea and offshore forms, and a signed, gate-protected record of avoided energy, water and emissions.