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John Mikale Strong's unpublished story was titled "Underseas." Copyright records and the Screen Achievements Bulletin give screenplay credit to Delmer Daves and Lou Breslow. Copyright records indicate that technical director Rigden Crawford was an expert diver, and that additional underwater scenes were filmed near Santa Catalina Island, CA. Harry Frink supplied his collection of empty liquor bottles to the production, as the bottles were difficult to obtain during Prohibition.