Duke E. Gifford (John Wayne) is second in command of the USS Thunderfish, a submarine which is firing off torpedoes that either explode too early or never explode at all. It's a dilemma that he'll eventually take up personally. Even more personal is his quest to win back his ex-wife (Patricia Neal), a nurse; but he'll have to win her back from a navy flier who also happens to be his commander's little brother.
We know this movie is going to be an eye-roller during the opening scene in which the Thunderfish is transporting two nuns, a baby and a group of orphans who go running past a ludicrously tolerant crew as they're trying to sink a Japanese ship. While the action scenes are good, nearly every human moment in this film is phony; and the few that aren't are thanks to the usual expert performance from Patricia Neal, not from writer-director George Waggner.
The special effects and production values in this submarine drama are okay, but occasionally we'll see a cable pulling a torpedo or a night-time sky that has a ceiling and a corner. Max Steiner's score underlines every banality in the script and then underlines it twice more. At one point a crew member laughs at the Hollywood hokum in the Cary Grant film, "Destination Tokyo." If only he could have been out in the audience for his own picture.