Can't wait for Silent Hunter 4.
SH3 was absolutely fantastic as everyone knows.
Just thought I would mention the USS COD.
A Gato class Submarine.
It's a museum in Cleveland, Ohio...USA.
I've visited it a few times and it's great.
Check out it's website. It's got its history and It's also got links to many other US Subs and their history's.
http://www.usscod.org/