Melodrama of the baser comic book sort escorts seventeen year old Don Miller's heroic adventures aboard his scientist uncle's atomic powered submarine. Under Navy supervision, the sub, whose personnel is complete with a junketing senator, makes a depth test run. Soon, they are captured by men in bubbles and taken to a doomed city where it's discovered that ""Atlanteans"" are cultured people who know about America from having made raids on the coast. Don of course makes friends with them and persuades the chief's son to set them free. Immature.