Issues, solutions, and case studies for offshore-compute-cooling
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
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.
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…
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
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…
Venture capital · 1 source
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…
$226M · Consortium of Chinese state-linked enterprises · 3 sources
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…
Microsoft (corporate research) · 3 sources