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The working titles of the film were The Darkest Hour and Hell on the Dock. William P. McGivern's novel,The Darkest Hour, was serialized in Collier's (15 April-13 May 1955). Although his appearance in the film has not been confirmed, according to a Hollywood Reporter news item, Richard Bellis was in the cast. According to a modern source, Bonnie Lou Williams dubbed the singing voice of Joanne Dru. Much of the film was shot on location throughout San Francisco, CA. Extensive shooting was done in and around the Fisherman's Wharf and San Francisco Bay.