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Director: Victor Saville
This is the VHS release (see more).
SummaryVivien Leigh and Conrad Veidt meet and fall in love, neither realizing the other is an enemy agent. When they learn the truth and Leigh is turned in to the authorities and deported, Veidt commandeers a U-boat to find and stop her ship. A gun battle between the U-boat and a British Q ship is the climax of the movie.
NotesThree times in the course of the movie, which is set in 1918, a U-boat stops a passenger liner by firing a shot across her bow, after which a few officers board the ship to check for contraband and for combatants among the passengers - a perfect illustration of the Prize Rules according to which the U-boats were theoretically supposed to operate.
Aside from Conrad Veidt, all the actors spoke with British accents regardless of which nationality they were meant to be representing, although German was spoken in scenes on board the U-boat.