There are underwater shots of a Nazi submarine, shots of the submarine facing off a dilapidated crane barge and shots of the crane barge sinking at the end of the movie. The torpedo looks to be a commonly used stock shot.
I have no idea who supervised the miniature work. It looks very like Bill Warrington's work. I would like to know if any one could furnish me with this information, I would be very interested to find out, please add it to the comments.
