Klaus Wennemann, who portrays the Chief Engineer, was forty one years old when the film was produced. The actual Chief Engineer of U-96, Hans Peter Dengel, was just over twenty five during his first patrol onboard the submarine. Dengel survived the war patrol, was promoted to Captain Lieutenant in 1943, and assigned as Chief Engineer of the type IX U-boat U-543. He was killed when the boat was sunk by an allied air attack in July 1944.

Film

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