To make it simple, you ain't gonna find any better than Dangerous Waters if you want to drive a modern nuclear boat. You have the 688(I), Seawolf, or Akula I & II if you wish. Plus much much more.
Got to
www.scs-dangerouswaters.com , and see for yourself all the great stuff you get with this game.
Go to the DW forum on this site and see the great response it gets and the support that it's given.
Oh yeah, and welcome..
Sea Demon