An hour and a half of gray scale, incomprehensible words and actors who understand perfectly well that the main thing in this film is not them, but the visual effects. Visual effects, by the way, are of high quality. It would have looked even better on the big screen (as it was planned), but because of Covid-19, the film only received a digital release.
In comparison with the book, the film presents us with a much shorter story. Book commander Krause (by the way, his name is George, in the film his name was changed for some reason) repelled much more attacks by submarines.
At the beginning of the film the captain's beloved Evelyn, or Evie, as he affectionately calls her, appears in his flashback. It wasn't mentioned in the book, it was Tom Hanks ' idea. It didn't make much sense: the flashback broke the linearity of the story, and added unnecessary sentimentality. The only thing we found out was that the captain's name is Ernest, Ernie. But it wasn't necessary to add a flashback for it.
Captain Krause's piety may also seem like a scriptwriter's trick, but this is exactly according to the book's сanon - he is the son of a Lutheran priest.