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Lieutenant Braden discovers that Sally, the woman he's been falling in love with, has actually been checking out his qualifications to be a U.S. Navy frogman. He must put his personal life behind him after being assigned to be smuggled into a Japanese-held island via submarine to photograph radio codes.

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  Gordon Douglas
• 
  C.M. Florance

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  James Garner
  Lt. J. G. Kenneth M. Braden
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  Edmond O'Brien
  Commander Paul Stevenson
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  Andra Martin
  Sally Johnson
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  Alan Hale Jr.
  Lt. Pat Malone
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  Carleton Carpenter
  Lt. Phil Carney
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  Frank Gifford
  Ensign Cy Mount
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  William Leslie
  Lt. Doherty
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  Richard Bakalyan
  Seaman Peck
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  Edd Byrnes
  Pharmacist Mate Ash
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  Sean Garrison
  Seaman Floyd
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  Henry Kulky
  Chief Petty Officer York
• 
  Warren Oates
  Seaman Kovacs
• 
  Clifford Kawada
  Japanese (uncredited)
• 
  Frank Watkins
  Gruber (uncredited)
• 
  Peggy Moffitt
  Jukebox Girl
• 
  Bernie Hamilton
  Seaman Weary