[fred_is_fred]

Being under the ocean in a metal box you don't get too many micro-meteors or cosmic rays though.

[samsk]

...and costs pennies compared to putting anything up there, so it can even enjoy those cosmic goodies.

[gehsty]

Just like you don’t get much water in space.

[manquer]

My understanding was that access to very large body of cold water was a core feature for the project. The water was to be used for cooling relatively efficiently or cheaply.