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#offshore-compute-cooling

Issues, solutions, and case studies for offshore-compute-cooling

Solutions 2

#00213Relocate compute into orbit, powered by continuous sunlight and cooled by radiators

Place accelerators on satellites in sun-synchronous orbit, drawing near-continuous solar power, rejecting heat through radiators, and linking satellites by free-space optical fabric. One GPU has flown; independent analyses put costs at least an order of magnitude above equivalent

#00212Relocate compute into submerged or floating offshore modules cooled by seawater

Seal servers in nitrogen-filled modules on the seabed or floating platforms, using seawater as the heat sink and removing the facility from any residential area. Demonstrated at 24 MW in Shanghai. Microsoft proved the concept off Orkney, then declined to commercialise it.

Case studies 4

Starcloud (formerly Lumen Orbit), satellite bus by Astro Digital, launch by SpaceX · since 2025 · Global

Starcloud-1 launched on a Falcon 9 from Cape Canaveral on 2 November 2025 into a 325 km orbit: a 60 kg satellite on an Astro Digital Corvus-Micro bus carrying a single Nvidia H100, with a design life of approximately 11…

Satellite mass60kg
Accelerators flown1Nvidia H100

Venture capital; $200 million raised in total, including a $170 million Series A led by Benchmark and EQT at a $1.1 billion valuation · 4 sources

Gerard Antoun

Nautilus Data Technologies · since 2021 · City

Nautilus Data Technologies commissioned a Tier III certified floating barge data-center on the Stockton, California waterway in 2021, providing 6.5 MW of critical IT load across ~20,000 sq ft at rack densities of ~55 kW…

Critical IT load6.5MW
Rack density supported~55kW per rack

Venture capital · 1 source

Gerard Antoun

HiCloud Technology, with Shenergy Group, Shanghai Telecom and CCCC Third Harbor Engineering · since 2025 · City

The only commercial-scale underwater data-center in operation as of 2026. Servers sit in sealed watertight units offshore from Lingang, positioned between phases of an existing offshore wind farm; construction completed…

Phase 1 capacity2.3MW
Full build capacity24MW

$226M · Consortium of Chinese state-linked enterprises · 3 sources

Gerard Antoun

Microsoft Research, with the European Marine Energy Centre · 2018–2020 · Neighborhood

Microsoft deployed a sealed, nitrogen-filled cylindrical vessel containing 864 servers to the seabed at 117 feet off Orkney, powered by the islands' wind and solar grid, and retrieved it two years later. Phase 1 had bee…

Servers deployed864servers
Deployment depth117feet

Microsoft (corporate research) · 3 sources

Gerard Antoun

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