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The daring exploits of a submarine commander whose mission is to chart the minefields in the waters of Japan during World War II.

Carrier pilot Lieutenant Bob Bingham (Mark Stevens) is rescued at sea by a submarine after he freezes at the controls and crashes, killing his two crewmen. He returns to civilian life but soon afterwards, looking for redemption, applies for submarine duty. At the New London, Conn., training base he renews acquaintance with Commander Heywood (James Millican) and Lieutenant Gates (Douglas Kennedy), the skipper and engineering officers of the sub that rescued him at sea. Bingham falls in love with Navy nurse Lieutenant Susan Peabody (Dorothy Malone), daughter of Warrant Officer Peabody (Charles Winninger) and the steady girl friend of Gates. Heywood gets a submarine command at the outbreak of the Korean "police action" and Bingham and his friend, Lieutenant Graham (Bill Williams), are part of the officer's group on Heywood's sub.

Elmer Doolittle (Buster Keaton), an apprentice seaman doing training at the U. S. Navy's San Diego Training Station, can't seem to keep out of trouble or the brig. Most of his problems derive from the fact that the girlfriend, Dorothy (Dorothea Kent), of Gunners Mate Richard Mack (Vernon Dent)take a liking to Elmer.