While unterseeboot is just a general term for submarines in German. U-boat is usually used to describe German military subs from both World Wars. As such, the

While unterseeboot is just a general term for submarines in German. U-boat is usually used to describe German military subs from both World Wars. As such, the suggestion of UBoatyMcUBoatface for a British sub is going to fly like a lead Zeppelin.