The film's opening prologue states: "La Rochelle, France. Autumn, 1941. Germany's vaunted U-boat fleet, with which Hitler hoped to blockade and stamp out Britain, is beginning to suffer its first major setbacks. British freighters are now sailing the Atlantic with stronger and more effective destroyer escorts, inflicting heavy losses on the U-boats. Nevertheless, the German High Command orders more and more U-boats, with ever younger crews, into battle from their ports in occupied France. The battle for control of the Atlantic is turning against the Germans. 40,000 German sailors served on U-boats during World War II. 30,000 never returned."

Film

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