The filming of the submarine sequence took place on the deck of USS "Kleinsmith" (APD-134) while the ship was off Key West, FL on 11 January 1951. Much of the boat and high-speed transport scenes were shot between 15 January and 6 February 1951 from the deck of "Kleinsmith", while the ship was off St. Thomas, U.S. Virgin Islands. USS "Taconic" (AGC-17) appeared as the command ship. As spoken in dialog, the submarine's name sounds like "USS Jackass 259", but is actually "USS Jack SS-259". The real USS "Jack" (SS-259) was not actually used in the film, as it was out of commission at the time.