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.
| Actor | Role |
|---|---|
 Mark StevensBob Bingham | Bob Bingham |
 Dorothy MaloneSusan Peabody | Susan Peabody |
 Bill WilliamsTom Graham | Tom Graham |
 Charles WinningerOliver J. Peabody | Oliver J. Peabody |
 Douglas KennedyLt. Dore Gates | Lt. Dore Gates |
 James MillicanCmdr. Heywood | Cmdr. Heywood |
 William HenryInstructor | Instructor |
 James SeaySkipper | Skipper |
 Carleton YoungPsychiatrist | Psychiatrist |
 Ralph SanfordCharles Hedley | Charles Hedley |
 John AlvinProfessor | Professor |
| BBob RoseAnniston | Anniston |
 Charles BronsonSubmariner (uncredited) | Submariner (uncredited) |