Operation Pacific is a 1951 black-and-white World War II submarine war drama from Warner Bros. Pictures, produced by Louis Edelman, and written as well as directed by George Waggner. John Wayne and Patricia Neal star and Ward Bond and Philip Carey play supporting roles. Much of the film is set aboard a Gato-class submarine. The technical advisor was World War II Admiral Charles A. Lockwood, Commander, Submarine Forces, Pacific (COMSUBPAC). Plot During World War II, the submarine USS Thunderfish, under the command of CDR John T. "Pop" Perry (Ward Bond), while on a special mission to the Philippines takes charge of a group of nuns and children, including a newborn infant nicknamed "Butch", transporting them to Pearl Harbor. On their way, the sub sights a Japanese aircraft carrier and attacks, but its torpedoes malfunction, exploding halfway to the target. Pursued by the carrier's escorting destroyers, Thunderfish manages to escape. While in Pearl Harbor, the ship's Executive Officer, LCDR Duke E. Gifford (John Wayne) goes to visit Butch at the base hospital, and runs into his ex-wife, LTJG Mary Stuart (Patricia Neal), a Navy nurse, and they kiss passionately. Unfortunately, Mary is now romantically involved with Navy pilot LTJG Bob Perry (Philip Carey), Pop's younger brother. Duke pursues Mary anyway, but is sent to sea again before anything is settled. As the sub returns from the patrol, they spot a Japanese freighter, but again their torpedoes fail to explode. The enemy ship raises the white flag, and Thunderfish surfaces and approaches. The freighter turns out to be a heavily armed Q-ship that opens fire on the sub. Mortally wounded, Commander Perry orders the boat to crash dive, knowing that he will not be able to get below before she submerges. With the sub now under Duke's command, he takes the offensive against the Q-ship. He notifies the crew that the boat will "battle surface" after moving into position to attack the ship. On surfacing, Gifford orders the boat's deck guns and anti-aircraft guns, as well as numerous portable light and mountable heavy machine guns operated by the deck crew, to fire at will. After the Q-ship's bridge is disabled and the ship set afire, Duke orders flank speed, ramming the sub into the Japanese ship, holing the engine room and sinking the Q-ship. Thunderfish, with her forward torpedo room seriously damaged but flooding contained, limps home for repairs. Back at Pearl