The AI boom has a real estate problem. Data centers are thirsty, power-hungry and increasingly unwelcome; a Gallup poll in March found 70 percent of Americans oppose building one in their community. So developers are looking somewhere with no neighbors to object and a limitless supply of coolant: the ocean.
The idea is not new. Microsoft sank 864 servers off Scotland's Orkney Islands in 2018 and found they failed at roughly one-eighth the rate of land-based machines, probably because a sealed, oxygen-starved capsule spares them humidity, temperature swings and clumsy human hands. Yet Microsoft ended the project in 2024 and never scaled it, deterred by permits and the awkward truth that you cannot easily swap out a broken server sitting on the seabed.
Others are pressing ahead where Microsoft pulled back. China switched on what may be the world's first wind-powered underwater data center off Shanghai, a $226 million facility that uses seawater instead of refrigerated fresh water and claims at least 30 percent less electricity. Japan is testing floating platforms near Yokohama that run on their own solar panels; Singapore's Keppel is building a four-story floating data center due in 2028; South Korea is planning an underwater site near Ulsan for more than 100,000 servers. The appeal is consistent: less land, less freshwater, cooler machines.
A more radical version of the same instinct surfaced this week in Kenya, where a Greek company has floated a $1.5 billion proposal for a Mombasa data center powered entirely off the grid by an offshore liquefied natural gas platform that would combine fuel processing, generation and cooling out at sea. As one local engineering analysis dryly noted, “grid-free” does not mean infrastructure-free. The concept still needs export cables, mooring systems, hazardous-area zoning and a marine baseline study, and so far the developer has disclosed almost none of it.
That caution points straight at the catch. Moving servers offshore relocates the environmental problem rather than dissolving it. The cooling water comes back warmer, and operators of existing seabed sites in China and Portugal already report the surrounding water running about one degree Celsius hotter. Marine species that depend on stable temperatures for breeding and feeding do not need much of a nudge, and the UN reckons roughly 60 percent of marine ecosystems are already degraded. A warming ocean is also, inconveniently, a worse coolant.
So the sea is less an escape hatch than a trade. It eases the pressures that make land-based data centers so contentious, the land, the freshwater, the angry neighbors, while creating fresh questions about thermal pollution, maintenance and who regulates a computer farm bobbing in territorial waters. The real test, as one researcher framed it, is whether the ocean can become AI's next computing frontier without becoming its next environmental problem. The scramble to build is already answering the first half of that question. The second half will take a good deal longer.