Proven technology

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 The viability of underwater data centers has already been demonstrated by Microsoft, which has deployed several over the past decade as part of its Project Natick experiment. The most recent was recovered from the seabed off the Scottish Orkney islands in 2020, and contained 12 racks with 864 servers.

Microsoft reported that only a "handful" of servers failed during the course of its experiment, and required less maintenance due to the reduced risk of environmental contamination like dust and debris and reduced thermal shock. 

Conclusion:

Microsoft's Project Natick, an experiment involving the use of underwater data centers, has concluded that the servers within the center were up to eight times more reliable than their dry-land counterparts. The project also showed that underwater data centers are more energy efficient, particularly in areas where the grid is not considered reliable enough for sustained operation. The underwater data center was placed on the sea floor off the coast of Scotland's Orkney Islands. Researchers will now look into what was responsible for the higher reliability rate.