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The following acknowledgment appears in the opening credits: "The producers wish to thank the Navy Department for their cooperation in making possible the filming of this picture-and to express especial appreciation to Commander Louis H. Gwinn, U.S.N.R., whose technical aid and advice were of the utmost assistance." According to information in the Paramount Script Collection at the AMPAS Library, Comm. Gwinn also contributed to the original screenplay. A May 21, 1943 Hollywood Reporter news item noted that actor Jon Gilbreath was a Minesweeper Training Officer for the 12th Naval District during World War II. According to a June 23, 1943 Hollywood Reporter news item, underwater scenes were shot off of Santa Catalina Island, CA, in June 1943.