Tom Swift and the Electronic Hydrolung

A young inventor and his companions design and refine an electronic hydrolung with an ion-drive and density-control mechanism, then deploy it in a series of maritime adventures. They attempt recovery of a returning space probe, carry out undersea surveys, and face covert submarine and frogman attacks while investigating sabotage, kidnapping, and hoax operations. Episodes combine hands-on technical problem solving, detection tests, and tracking of marine life with tense rescues and explosive confrontations, emphasizing teamwork and scientific ingenuity as the group overcomes dangers and uncovers clues beneath the ocean surface.