Posing as an ex-German medical officer, a U.S. Navy Intelligence Officer sets out to rescue a kidnapped scientist, and sink a Nazi submarine, hiding off the coast. Mystery Submarine is a American war film directed by Douglas Sirk starring Macdonald Carey, Märta Torén and Robert Douglas. Mystery Submarine (Douglas Sirk, ) 6/ B-film set after the war about the rescue of a scientist and the attempt to destroy a rogue Nazi submarine.
Mystery Submarine (). An undercover Navy officer (Macdonald Carey) rescues a duped widow (Märta Torén) and a scientist from the captain (Robert. Mystery Submarine  [DVD]. Robert Douglas (actor) Reginald Carey (actor) Format: all-region dvd (worldwide) Runtime: 78 min. Quality: Very Good. The trendy elegance of director Douglas Sirk's later big-budget soap operas is nowhere to be found in Sirk's Atomic-Age melodrama Mystery Submarine.