Mike trains three brothers in the use of scuba gear, unaware that they plan to break a fourth sibling out of Alcatraz.

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.

As consultant on a remake of The Count of Monte Cristo, Mike finds that the emotions of the star and his stand-in may lead to disaster in the execution of a stunt.

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

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

Mike comes to the rescue of a scuba diver who has been trapped in a kelp bed while spear fishing.

Mike races to recover a ditched nuclear warhead before sea water corrodes the casing.

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.

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.

While checking the underwater security of a new dam, Mike discovers a bomb that has been placed in an intake valve.

In an effort to prevent a dock fire from igniting chemicals stored in a warehouse, Mike swims into the building through an intake pipe.

Drug smugglers force Mike at gunpoint to help them retrieve a sunken shipment of narcotics.

After discovering a sunken Japanese submarine, the amateur skin diver who found it goes violently berserk.

Mike investigates the deaths of a pair of divers who were murdered after discovering a sunken yacht laden with jewels.

While looking into the possibility of linking two Latin American lakes by a canal, Mike runs afoul of rebel guerillas.

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

A Greek sponge diver and his pretty girlfriend lay a minefield for Mike, fearful that he will interfere with their discovery of a valuable statue on the Mediterranean seabed.

A man tricks a scientist into dropping a top-secret folio overboard, where a confederate can retrieve it.

Mike attempts to rescue a geologist who has been trapped in an underwater cave by a sudden landslide.

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

Mike and a pair of archaeologists risk the anger and booby traps of islanders while exploring underwater caves in the Caribbean.

Latin American revolutionaries recruit Mike to recover the body of their murdered leader from the palace lagoon in order to ignite an uprising.

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.