[Sgtmonkeynads]

I just saw this episode of the twilight zone. Yes, it was on late lastnight. Anyway....It involved a U-Boat using it's deck gun to sink a ship.
My question is that it showed the gun crew going down ropes from the top of the tower to the deck below.
I always thought they had a hatch to get to the deck gun quickly? I know that the show may not be pin-point perfect, but was this done in real llife? And if so which type sub could it have been?
It was set in '42.
Good story, made me think twice about sinking a passenger/cargo today.