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The working title of this film was 12 Mile Reef. Within the film, the Greek American fishermen refer to their rivals as "English," even though they are American. A May 7, 1953 Hollywood Reporter news item includes Betty Madigan in the cast, but her appearance in the completed picture has not been confirmed. Puppeteer Jack Shafton created miniature diving figures that were used in underwater sequences in the film. According to studio production records in the AMPAS Library file on the film, while filming at Tarpon Springs, FL, Robert Wagner "nearly drowned" when he was accidentally kicked in the stomach by another swimmer. According to the Hollywood Reporter review, the film was shot entirely on location at Tarpon Springs and Key West, FL, but a May 26, 1953 Hollywood Reporter news item noted that the "final underwater scenes" were shot at Nassau in the Bahamas. Underwater scenes were shot with the use of a specially designed French underwater camera called the Aquaflex. Cameraman Edward Cronjager was nominated for an Academy Award for Best Cinematography (Color) for the film.