I first saw the original Das Boot as a television mini series on BBC2. According to Wiki this comprised six fifty minute episodes and was in 1985. The original 149 minute film had been released in 1981 but I hadn't been aware of it.
https://en.wikipedia.org/wiki/Das_Boot
I thought it refreshing and brilliant.
I now have the Blu ray version and on watching it again, whilst still enjoyable and thought provoking, I agree with the author of the original book when he criticises '
the hysterical overacting of the cast'. I would say 'some of the cast'.
I can see no reason to remake it as it was already technically superb. Naval films that could be remade with good use of CGI could cover the sinking of the Bismarck or Scharnhorst, or even the battle of Jutland. There is already excellent (but not perfect) coverage of the sinking of the Blucher in the invasion of Norway: