Mike and two cameramen are imperiled when an irrationally jealous man drops their camera cage into shark-infested waters.

A group of sportsmen hire Mike to supervise their skin-diving outing, whereupon one of them sneaks off and begins photographing secret Navy facilities.

Mike is hired by an insurance company to investigate the sinking of a freighter, but a murder indicates that someone doesn't want him to complete his task.

While testing the coastal security of a rocket fuel plant, Mike discovers a pair of saboteurs.

Mike is hired to retrieve a new guided-missile tracking device from a test boat sunk during a Florida hurricane, but finds that underwater thieves have beaten him to the punch.

A man planning to murder his wife hires Mike to teach her to scuba dive so that he may lure her into a dangerous underwater current.

A young skindiver is found murdered after stealing lobsters from an elderly fisherman as an initiation stunt.

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

Mike goes after a newlywed teenager turned fugitive after a bungled holdup prompts him to hide in the city's storm drain system.