I realize that in order to make the movie work, they would have to gloss over some of the technical aspects. Given sufficient time, the Americans could probably figure the systems out. But, in the time frame of the movie, it just isn't possible.
To anyone who isn't familiar with submarines, it might seem like I'm nit-picking. All I'm saying is that it isn't a realistic portrayal. It was entertaining enough, but I might have enjoyed it more if I was ignorant of the subject. I never even touched on the American boat at all. The scene where a crewman is tapping on pipes with a hammer in the Control room in order to find weak spots just would not have happened. A boat in such a deplorable state would not have been allowed to leave port - war, or no war.
Actually, U-571 isn't as bad as
Hunt For Red October. That movie had us in stitches, it was so unbelievable.
The submarine movie that would be the most realistic is, of course,
Das Boot. Great movie. I'm glad I wasn't there.