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This World War II drama based on a true story charts the actions of Capt. Bernhard Rogge (Van Heflin) and the crew of the German vessel &NFi;Atlantis&NFi_; as they navigate through enemy waters and stealthily sink Allied ships. British Adm. Russell (Charles Laughton) is tasked with investigating the attacks and gets a much-needed assist from an American spy (Alex Nicol) who recovers top-secret information from the German ship.