The old submarine,Sea Tiger is finally sent on a real mission after several errand jobs. Their task is to attack an abandoned Japanese ammo dump to take explosives that the US desperately needs.
Yeoman Hunkle and Lt. Claire Reid are trapped in the submarine's flooding torpedo room. Commander Sherman faces a difficult decision concerning the two when evasive actio beeds to be taken.
Holden arranges the swiping of two torpedoes from a supply base so the Sea Tiger can go into action, but just as they get their opportunity for their first combat engagement, the Captain is stricken with a seeming case of appendicitis.
Holden and Nurse Duran bring a goat and a baby aboard just as the crew is attempting frantically to conceal the nurses when a tough admiral arrives for an inspection.
The five nurses are becoming claustrophobic aboard the submarine. When given the opportunity for R&R the women jump at the chance to fly to Pirt Moreby not realizing how much they'll miss their naval situation.
The submarine has orders to transport a secret personage, and are instructed he will stay in his cabin, and not to bother him. From catching glimpses of him as he boards, everyone on the crew is convinced it's General Douglas MacArthur.
