I've been following the submerged datacenter of Microsoft for some time now, but only today I noticed that the project has ended. Project Natick contributed quite some resources to WCG, so it might be of interest to you as well.

The underwater datacenter was a test and so far, these are the key findings they gathered:

• Reliability: The servers in Natick Northern Isles showed a failure rate of 1/8th that of our land-based control group.
  
• Community Service: Natick was used to perform COVID-19 research for Folding at Home and World Community Grid.
  
• Recycling: The steel pressure vessel, heat exchangers, servers, and all other components will be recycled.
  
• Sea bed: The sea bed is being restored to the same state it was in before we deployed.
  

See the links below for some more information about their efforts.

News article: https://singularityhub.com/2020/09/17/microso...er-and-it-totally-worked/
Team homepage: https://natick.research.microsoft.com/
Youtube video: https://www.youtube.com/watch?v=lBeepqQBpvU
Team stats: https://www.worldcommunitygrid.org/team/viewTeamInfo.do?teamId=1HX3T6DHB2