A man claims to have invented a machine that can locate ships carrying gold.

Mike interrupts an underwater survey in the Gulf of Mexico in order to save a diver whose air line has become snarled.

Mike investigates an underwater grotto said to feature a mermaid that lures men to their deaths.

Mike leads a diving team in rescuing a Latin American diplomat and his family from kidnappers.

Mike discovers an important manganese deposit, but an ambitious young geologist, sharks, and an approaching hurricane threaten to silence him before he can inform the government.

Mike and a group of astronauts-in-training are stranded on the seabed when a hurricane blows their boat away.

Mike is hired to dive on a sunken freighter in New York Harbor in the hopes that some crew members may still be alive in air pockets.

Mike discovers a submarine off the Panama coast that is a base of operations for divers planning to destroy the Panama Canal.

Mike defies tales of a mysterious sea serpent when he searches for a shipment of stolen liquid explosives in Arabia.

Mike investigates the mysterious death of the featured performer in a water ski show during the act's underwater finale.