Revealing mistake: In one scene just before the attack on a big Hunter the young captain (Jürgen Prochnow) is sitting with his charts. Beside him he has got a glass of beer standing. The sub lurches heavily right and left in the hard weather, but the surface of the liquid stays the same.
Continuity mistake: At the end of the first attack by the destroyer - where she misses the U-boat and throws her bombs further away - the boatswain makes 22, then 23 strokes on the slate of the Control Centre,thus counting the number of depth charges used against the boat. A few seconds later, in a shot from another angle, with the slate in full view, we see only 22 strokes. (01:03:30)
Trivia: All the actors were fluent in English and dubbed themselves in the English version.
Trivia: The full sized mock up of the U boat was rented by Steven Spielberg for use in the first Indiana Jone's film.
Trivia: The movie is based on actual events and some of the characters have existed in real life. One of them, Pilgrim, took his own life after the book on which the movie is based was released.
2nd Lieutenant: First time on U-boat?
Lt. Werner: Yeah. First time. It's gonna be exciting.
2nd Lieutenant: Do you have a will?
Lt. Werner: Excuse Me?
2nd Lieutenant: 13 boats down last moth. Sank with men and mice. Exciting, huh?
Captain: April fool. Practice makes perfect.
Captain: Phillip, the old bunch is gone. Look at these new heroes. All wind and smoke. Just big mouths.
Thomsen: Yeah, yeah. They keep together, balls in hand. And the belief in our Führer in their eyes.
Captain: They will know in time.
Question: During the film one of the officers was holding a bottle of Becks beer. Was the label on the bottle age/era appropriate?
Question: I know practically nothing about submarines, so this seemed a bit strange to me. When there's that huge storm, why do they keep staying at the surface, only going down for an hour at a time?
Question: The enemy is referred to as "tommies". Why do they call them that?
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