Yes, very very difficult to get into especially if you don't have a manual infront of you.
Beetle, don't forget that there's **** sticking down out of the Sub too. The depth meter is telling you where the Center of Mass is.
It's very difficult, but I'm intrigued by it. So far, the best I've done is torpedoed the enemy ship only to be torpedoed myself by the sub I didn't see which was 1 NM off my starboard side.