Episode 1
Mike trains three brothers in the use of scuba gear, unaware that they plan to break a fourth sibling out of Alcatraz.
Episode 2
Mike unwittingly shares his explosives expertise with an old navy buddy who is planning an underwater bank heist.
Episode 3
While testing the coastal security of a rocket fuel plant, Mike discovers a pair of saboteurs.
Episode 4
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.
Episode 5
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.
Episode 6
An overconfident swimming champion endangers both herself and Mike when she challenges him to an underwater race to Catalina.
Episode 7
Mike and a group of astronauts-in-training are stranded on the seabed when a hurricane blows their boat away.
Episode 8
Mike comes to the rescue of a scuba diver who has been trapped in a kelp bed while spear fishing.
Episode 9
Mike races to recover a ditched nuclear warhead before sea water corrodes the casing.
Episode 10
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.
Episode 11
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.
Episode 12
While checking the underwater security of a new dam, Mike discovers a bomb that has been placed in an intake valve.
Episode 13
In an effort to prevent a dock fire from igniting chemicals stored in a warehouse, Mike swims into the building through an intake pipe.
Episode 14
Drug smugglers force Mike at gunpoint to help them retrieve a sunken shipment of narcotics.
Episode 15
After discovering a sunken Japanese submarine, the amateur skin diver who found it goes violently berserk.
Episode 16
Mike investigates the deaths of a pair of divers who were murdered after discovering a sunken yacht laden with jewels.
Episode 17
While looking into the possibility of linking two Latin American lakes by a canal, Mike runs afoul of rebel guerillas.
Episode 18
Mike discovers a submarine off the Panama coast that is a base of operations for divers planning to destroy the Panama Canal.
Episode 19
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.
Episode 20
A man tricks a scientist into dropping a top-secret folio overboard, where a confederate can retrieve it.
Episode 21
Mike attempts to rescue a geologist who has been trapped in an underwater cave by a sudden landslide.
Episode 22
Mike investigates the mysterious death of the featured performer in a water ski show during the act's underwater finale.
Episode 23
Mike and a pair of archaeologists risk the anger and booby traps of islanders while exploring underwater caves in the Caribbean.
Episode 24
Latin American revolutionaries recruit Mike to recover the body of their murdered leader from the palace lagoon in order to ignite an uprising.
Episode 25
A young skindiver is found murdered after stealing lobsters from an elderly fisherman as an initiation stunt.
Episode 26
Mike defies tales of a mysterious sea serpent when he searches for a shipment of stolen liquid explosives in Arabia.
Episode 27
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.
Episode 28
A freak accident endangers a man's life during the test of Mike's new method of retrieving sunken ICBM nose cones.
Episode 29
A beautiful woman plots revenge against Mike after flunking out of his class for scuba diver instructors.
Episode 30
Mike tries to break a ring of drug traffickers who are smuggling heroin into the country in ballast tanks.
Episode 31
Someone attempts to kill Mike while he's scouting out a site for an underwater marine preserve.
Episode 32
Mike is recruited to train a pair of divers for an urgent secret assignment.
Episode 33
Mike uses an underwater TV camera setup to nab thieves who are robbing a Hawaiian girl's pearl beds.
Episode 34
Mike stands by to assist an undercover man in his assignment to infiltrate an illegal alien-smuggling ring.
Episode 35
A husband-wife team steal and then ransom some computer tapes necessary to a plant's operations.
Episode 36
A careless salvage diver is trapped on the deck of a sunken freighter by some lead cable.
Episode 37
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.
Episode 38
A coastal fisherman wages a private war against kelp harvesters, blaming them for ruining the fishing grounds necessary to his livelihood.
Episode 39
Mike dives onto a sunken freighter loaded with nitro, planning to detonate the cargo before it drifts away into the shipping lanes.
