Corrected entry: A depth charge explodes right off the starboard bow, and the whole front end of the sub actually bends and snaps back. The force of the explosion wouldn't cause it to bend, it would either break off completely or there would be a large hole.
Corrected entry: The Germans drop the bombs down on the submarine at the rate of two every 5 or so seconds. So how come there are sometimes many many explosions around the submarine within a very short space of time?
Corrected entry: Almost at the end of the movie, the sub is being chased by a German destroyer. One of the destroyer cannon shots hits the stern portion of the U-Boat (where the diesel and electric motors are located). That hit should have instantly killed Tank (in the electric motors room) and maybe also Trigger (they are both working to fix the stern torpedo tube). (01:43:23)