Seasons & episodes

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

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

After one of their number is wounded in the robbery of a beach side casino, a team of thieves kidnap a doctor's wife in order to lure the physician into a trap.

A freak accident endangers a man's life during the test of Mike's new method of retrieving sunken ICBM nose cones.

A beautiful woman plots revenge against Mike after flunking out of his class for scuba diver instructors.

Mike tries to break a ring of drug traffickers who are smuggling heroin into the country in ballast tanks.

Someone attempts to kill Mike while he's scouting out a site for an underwater marine preserve.

Mike is recruited to train a pair of divers for an urgent secret assignment.

Mike uses an underwater TV camera setup to nab thieves who are robbing a Hawaiian girl's pearl beds.

Mike stands by to assist an undercover man in his assignment to infiltrate an illegal alien-smuggling ring.

A husband-wife team steal and then ransom some computer tapes necessary to a plant's operations.

A careless salvage diver is trapped on the deck of a sunken freighter by some lead cable.

A husband and wife team of photojournalists ignore Mike's warnings about diving on a sunken ocean liner and are imperiled by the pressures of the deep.

A coastal fisherman wages a private war against kelp harvesters, blaming them for ruining the fishing grounds necessary to his livelihood.

Mike dives onto a sunken freighter loaded with nitro, planning to detonate the cargo before it drifts away into the shipping lanes.