I wouldn't call it the best movie ever, but it is a very good one, and probably the best - most realistic - submarine movie so far.
Too many war movies paint war clean and tidy, and as entertaining popcorn movies.
I recommend to watch Das Boot as the 410 minutes miniseries, of which there are two versions. Second best option is the directors cut. The looser in this "competition" is the commercial first release to the cinemas, it cuts things too short.
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