After carrier pilot Lt Bingham is rescued at sea by a submarine when he crashes, he applies for submarine duty. During training he competes with Commander Heywood for the affection of Navy nurse Lt Susan Peabody. Heywood gets a new sub command at the outbreak of the Korean war and Bingham is assigned to his sub.

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Mark Stevens
Bob Bingham

Dorothy Malone
Susan Peabody

Bill Williams
Tom Graham

Charles Winninger
Oliver J. Peabody

Douglas Kennedy
Lt. Dore Gates

James Millican
Cmdr. Heywood

William Henry
Instructor

James Seay
Skipper

Carleton Young
Psychiatrist