I can't say much to how actually accurate the movie is, but what I do know is it is the closest thing I will ever get to knowing what it was like.
However, I have talked with a few U-boat veterans and they did say the book was very close, allbeit, a tad overly dramatic, but hey, they all agree, it was a novel and a movie, it was made that way for entertainment. So they never thought much into it.
If you are going to watch or rewatch it, I have to agree with the others above that the 5-hour version is the must see. If you don't watch it you are missing so much of what makes it great.
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