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The working title of the film was Hell Below. The opening credits contain the written statement: "Cooperation of the United States Department of Defense and the United States Navy in the making of this picture is gratefully acknowledged. In the film, the roles of "Jane Doyle" and "Dee Dee Doyle," "Lt. Cmdr. Barney Doyle's" wife and daughter, appear only in the film's several flashbacks, as Barney recalls his family life. The film received an Academy Award in the Special Effects (Visual Effects, A. Arnold Gillespie; Audible Effects, Harold Humbrock) category.