U-Boote westwärts (1941)
U-Boote westwärts ! (in English: U-boat Westward!) was a 1941 German war propaganda film promoting the Kriegsmarine. It concerns a U-boat mission in the Battle of the Atlantic and was produced by UFA. The U-boat used for the film was U-123, which would later play a major role in Operation Drumbeat.
More at Wikipedia.