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.

L'ufficiale pilota Bob Bingham incontra dopo la guerra il tenente Gates che l'aveva salvato dopo un disastro aereo. I due partono insieme per la guerra di Corea, dove danno prova di valore militare. Una donna, Susan, li attende. Quando, feriti, ritornano, Susan si lega a Bob.