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In this thrilling, Academy Award®-winning drama (Best Special Effects, 1943), Tyrone Power plays Navy Lieutenant Ward Stewart, a crewmember aboard a sub responsible for investigating a suspicious tanker in the Atlantic. Initially Stewart takes a liking to his Commander - Dewey Connors (Dana Andrews) - until he realises that the woman he has fallen in love with is actually Connors' fiancee. Not only that, but, once the crew tracks the tanker to an island, they discover that it is really a German Q-boat and the island is a Nazi supply base! Tension explodes as the two men must work together to defeat the enemy - and come to terms with their rivalry!