Underwater data centers move from prototype to commercial buildout

Overview

Updated May 31

A sealed steel capsule sits on the seabed off Shanghai's Nanhuizui coast, drawing more than 95% of its power from offshore wind turbines and using cold seawater to cool its servers. It is the world's first wind-powered underwater data center, and its operators have signed deals to scale the design into a 500-megawatt cluster.

The land-based grid is no longer the only path. Oregon startup Panthalassa raised $140 million in early May to build wave-powered floating ocean compute nodes. Peter Thiel led the round; Marc Benioff, Max Levchin, and John Doerr also invested, valuing the company near $1 billion.

Why it matters

AI's power and water demands are outrunning the grid; subsea data centers point to a way around both bottlenecks at once.

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Key Indicators

1.15

Power Usage Effectiveness (PUE)

Ratio of total facility power to server power. The global average for land-based data centers is about 1.5; lower is better.

95%+

Share of electricity from offshore wind

Direct supply from nearby turbines, with grid backup for the remainder.

500 MW

Planned cluster capacity

Target size of the follow-on subsea cluster agreed by Hicloud, Shenergy, China Telecom, and CCCC.

Liters of freshwater used for cooling

Seawater replaces the millions of liters a comparable land facility would consume each year.

22.8%

Reduction in total power consumption

Operator estimate versus an equivalent land-based facility, driven mostly by passive seawater cooling.

12,000 t

Annual carbon emissions cut

Operator estimate of CO₂ avoided each year compared with a land-based equivalent on China's grid mix.

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People Involved

Ben Cutler

Project lead, Microsoft Project Natick (2014–2020)

Frequently cited authority on subsea data center engineering

Peter Thiel

Lead investor, Panthalassa Series B

Backing wave-powered ocean compute infrastructure

Organizations Involved

Shanghai Hicloud Technology

Cloud and data center operator

Operator of the Lin-gang underwater data center

The Shanghai-based cloud operator running the Lin-gang underwater data center and leading the planned 500-megawatt cluster.

Shenergy Group

Shanghai municipal energy company

Power partner supplying offshore wind to the Lin-gang facility

Shanghai's main municipal energy group, supplying the offshore wind power that drives the Lin-gang underwater data center.

China Communications Construction Company (CCCC)

State-owned infrastructure contractor

Marine construction partner for the subsea capsules

China's largest port and marine engineering contractor, building and installing the subsea capsules for the Lin-gang project.

Highlander (Hainan Highlander Information Technology)

Subsea data center developer

Operator of the Hainan underwater data center, the Chinese precursor to Lin-gang

The company behind China's first commercial underwater data center off Hainan, which proved out the basic capsule design later scaled at Lin-gang.

Microsoft

Technology company

Concluded research project; technical precedent for current buildout

Microsoft's research program that ran a sealed, server-filled capsule on the Scottish seabed for two years and showed it outperformed land-based equivalents on reliability.

Panthalassa

Ocean data center startup

Pre-commercial; Ocean-3 pilot deployments planned for 2026

Oregon-based startup building wave-powered floating ocean compute nodes for AI workloads, backed by Peter Thiel, Marc Benioff, Max Levchin, and John Doerr.

Timeline

January 2014 May 2026

7 events Latest: May 9th, 2026 · 4 months ago

Tap a bar to jump to that date

May 2026
Shanghai brings world's first wind-powered subsea data center online
Latest Deployment

Hicloud confirms the Lin-gang underwater data center is operating off Nanhuizui, drawing more than 95% of its power from offshore wind and reporting a Power Usage Effectiveness (PUE) below 1.15.
May 9th, 2026
Partners commit to 500-megawatt subsea cluster
Commercial deal

Hicloud, Shenergy Group, China Telecom, and China Communications Construction Company sign agreements to scale the Lin-gang design into a 500 MW offshore wind-powered subsea data center cluster.
May 9th, 2026
Panthalassa raises $140M to build wave-powered floating ocean data centers
Funding

Oregon-based Panthalassa raises $140 million in a Series B led by Peter Thiel, pushing the company's valuation near $1 billion. Its 85-metre steel floating nodes generate power from wave motion, cool onboard AI hardware with seawater, and send data back via low-Earth-orbit satellites.
May 4th, 2026
December 2022
First commercial underwater data module deployed in Hainan
Deployment

Highlander drops the first commercial underwater data module off Hainan's Lingshui coast, beginning China's move from research to paying workloads.
December 1st, 2022
September 2020
Microsoft retrieves Natick capsule with strong reliability result
Research result

Microsoft pulls the Northern Isles capsule back up. Server failure rate is one-eighth that of an identical land-based control, validating the sealed-environment thesis.
September 14th, 2020
August 2018
Microsoft sinks Northern Isles capsule off Scotland
Deployment

A 40-foot pressurized capsule with 855 servers is lowered onto the seabed near the Orkney Islands for a two-year endurance test.
August 1st, 2018
January 2014
Microsoft begins Project Natick
Research

Microsoft Research starts a multi-year program to test whether commercial servers can run reliably inside sealed, seabed-mounted capsules.
January 1st, 2014

Historical Context

3 moments from history that rhyme with this story — and how they unfolded.

2010 – 2020

UK offshore wind scale-up (2010–2020)

British offshore wind grew from a few hundred megawatts of pilot projects to more than 10 gigawatts of installed capacity in a decade. Costs fell roughly 70% as turbine size, installation vessels, and seabed cabling matured. Projects like Hornsea One showed gigawatt-class offshore farms were buildable on commercial terms.

Then

Offshore wind moved from subsidy-heavy demonstration to one of the cheapest new sources of power in the UK by the late 2010s.

Now

It set the template for marine industrial buildout: a few state-backed pilots, then a contractor base (vessels, cable layers, port hubs) that could replicate sites quickly. China's offshore wind sector now plays the same role for projects like Lin-gang.

Why this matters now

The 500 MW Lin-gang cluster only pencils out because Shanghai's offshore wind is already cheap and the marine contractor base (CCCC and others) is in place. The same conditions that made gigawatt-class offshore wind routine are what make subsea data centers thinkable now.

August 2018 – September 2020

Microsoft Project Natick (2018–2020)

Microsoft Research lowered a 40-foot sealed capsule containing 855 servers onto the seabed off Scotland's Orkney Islands. After two years underwater, the team retrieved the capsule and counted failures. Servers inside had failed at one-eighth the rate of an identical control rack on land.

Then

Microsoft never turned Natick into a commercial product. The reliability data was the headline takeaway and the press cycle moved on within months.

Now

Every serious underwater data center proposal since, including Hainan and now Shanghai Lin-gang, leans on Natick's reliability numbers as proof the basic engineering works.

Why this matters now

Lin-gang is the first commercial-scale answer to the question Natick raised but never resolved: can sealed subsea capsules carry real production workloads, not just a research demo? The Shanghai project is essentially Natick built for paying customers and tied to offshore wind.

December 2022

Hainan underwater data center launch (2022)

Highlander dropped the first commercial underwater data module off Lingshui, on the south coast of Hainan island. The pod ran live cloud workloads on the seabed, becoming the first paying subsea data center anywhere. More modules followed over the next two years.

Then

Hainan proved the operating model on a small scale and gave Chinese regulators a working facility to permit and study.

Now

It set the engineering and regulatory baseline that the Shanghai Lin-gang project, larger and tied to offshore wind, builds directly on.

Why this matters now

Lin-gang is the second act. Hainan showed that capsules could host real workloads; Shanghai is the test of whether the model scales with renewable power and a hyperscale plan attached.