Mike helps the Immigration Department Border Patrol break up an underwater border-running operation.

An attractive magazine photographer hires Mike to assist her in getting pictures of a sunken barge off the coast of Mexico.

Hired to test a new electronic fish-finder, Mike encounters a village where every fish in the vicinity has disappeared.

Mike supervises a diamond diving expedition in South America, but discovers that his employers are poaching on someone else's property.

The State of Florida hires Mike to organize and train an underwater police force to deal with a series of underwater crimes.

A professor and his daughter hire Mike to help them search for a rare underwater plant in Costa Rica.

A frustrated former athlete pushes his children to be Olympic swimmers, resulting in their becoming trapped in a cave by a rising tide.

An underwater camera holds the key to determining whether a woman's drowning was accidental, as her husband claims, or not.

An overconfident swimming champion endangers both herself and Mike when she challenges him to an underwater race to Catalina.