21/08/2025
What does a cloud look like underwater?
In one of the most extraordinary experiments in tech history, Microsoft plunged a full data centre beneath the sea yes, underwater to test a bold idea: could the ocean help power and cool our digital future?
This unique project, known as Project Natick, involved submerging a steel capsule filled with over 800 servers off the coast of Scotland. The sea’s natural cold acted as a cooling system, eliminating the need for traditional energy-hungry cooling methods. Not only did it work, it exceeded expectations. After two years under the waves, only a handful of servers had failed, a fraction compared to land-based systems.
Why? The underwater environment provided stability: no oxygen to cause corrosion, no humans to disturb the setup, and a consistent cool temperature. It was quiet, efficient, and surprisingly eco-friendly. In fact, the entire operation ran on renewable wind and solar energy from the Orkney Islands.
The implications were huge. Data centres are notorious for their power consumption and heat output. But by going underwater, Microsoft showed how we can rethink infrastructure in harmony with nature. Not only did this ocean tech solution reduce energy use, it also opened up the possibility of deploying data centres in coastal regions to improve internet speed and reliability.
While the project has now concluded, its insights are helping shape a greener digital future, where innovation doesn’t just live on land.
Fun Fact: This underwater data centre was once used to assist COVID-19 vaccine research, all while sitting silently at the bottom of the ocean.
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