Quote Originally Posted by Chris Belcher View Post
I think that is a bode panzer key.
Certainly looks the same.

In all seriousness, regarding the idea that it was for a submarine - I find that difficult to support myself. I just can't see the need for such high security for something that was otherwise so well guarded (by men with guns, and by being surrounded by water most of the time!) and even if we assume that the submarine was being used to carry highly secret things, it's still a stretch for the imagination?