On Sat, 12 Sep 2015 14:11:24 -0400, Wayne.B
wrote:

It was built in secrecy to recover a sunken Russian submarine.

http://gcaptain.com/drillship-built-as-cia-spy-ship-to-raise-soviet-sub-falls-victim-to-oil-crash/#.VfRqMpcuM5t

That was a very slick operation conceived in the Nixon administration
and perhaps missed by the world in the confusion around his
resignation but it was really cool.