The U.S.S. Sea Tiger is on its last legs until the handsome skipper and his ingenious, if slightly unethical, junior officer scavenge the parts and supplies needed to put the sub back into action. Forced out to sea prematurely by an enemy air attack, the sub leaks and limps along until five stranded Army nurses come aboard and initiate their own renovations. From one mishap to another, the sub ends up a blushing pink, making it a target for both Japanese and American. forces.