China put a data center on the ocean floor — and it actually works

China's first commercial underwater data center went live near Shanghai in May 2026, and it is exactly as unusual as it sounds. The $226 million facility sits 35 meters below the surface, houses roughly 2,000 servers, and draws more than 95% of its electricity from an offshore wind farm with over 200 turbines. It is the world's first wind-powered underwater data center to reach full commercial operation, according to Tom's Hardware.

Where Microsoft stopped, China went further

Microsoft ran its own underwater data center experiment — Project Natick — from 2013 to 2024. The results were actually promising: hardware failure rates were lower underwater than on land. But Microsoft shelved the project, citing economics and the difficulty of servicing submerged equipment. China's HiCloud Technology, partnered with state-backed China Telecom, energy company Shenergy, and infrastructure group CCCC, turned the same concept into a working commercial facility.

Construction finished in October 2025, trials ran in February 2026, and full commercial operation began in May 2026. The 24 MW facility handles AI workloads, 5G infrastructure support, and big data processing.

The cooling argument

The core efficiency case is straightforward. Conventional data centers spend enormous amounts of energy keeping servers cool — typically tracked with a metric called PUE (Power Usage Effectiveness), where 1.0 is perfect and the industry average sits around 1.5. This facility achieves a PUE below 1.15 by using seawater as a passive coolant, cutting total power consumption by 22.8% compared to equivalent land-based facilities. It also uses zero freshwater — a real constraint as data center construction accelerates in water-stressed regions.

The engineering challenges are real. Saltwater corrodes, pressure builds at depth, and a technician cannot simply swap out a failed memory module on the seabed. Each module is designed to run autonomously for years without physical intervention, with remote management handling day-to-day operations and heavy redundancy covering hardware failures.

What comes next

Phase 1 is 24 MW. HiCloud and its partners are targeting a 500 MW subsea deployment long-term, per Data Center Dynamics. No US or UK equivalent is in development. American policy under the CHIPS Act favors onshore infrastructure, and UK marine protection regulations would add significant regulatory friction to any similar project. For now, the ocean floor belongs to China.