Mike's assignment: Retrieve a deadly radioactive capsule and restore it to a lead container without exposing himself to gamma radiation that could take his life.
Mike's vacation in The Bahamas is interrupted by the US Secret Service. They need him to search for two-million counterfeit dollars stashed at the bottom of the ocean.
When a dictator visiting the United States decides to land at a small harbor with almost no advance notice, Mike is called in by the Coast Guard for an underwater security check.
Sabbateurs have rigged a sunken ship with 50 tons of dynamite, and it's Mike's job to diffuse the monstrous time-bomb before it blows up an entire foreign nation's capital.
Mike is retained by a small Latin American country to train a cadre of underwater demolition experts. Mike and his team spring into action when the country's president is kidnapped.