Also interesting, and also related to undersea "clouds"; Microsoft / azure have actually launched underwater data centres. main benefits were cooling and ability to have compute in places closer to people by coasts who are away from main data centres I believe. Second point is moot when considering the existence of "local zones" but it was still a cool experiment (in my opinion). https://www.microsoft.com/insidetrack/blog/how-microsoft-kept-its-underwater-datacenter-connected-while-retrieving-it-from-the-ocean/