Episode 1
Mike tries to free the pilot of a downed jet from his watertight cockpit before his air runs out, without causing the man's death from the water pressure.
Episode 2
While investigating the cause of a mine flood that killed thirty men, Mike stumbles upon an air pocket with two survivors.
Episode 3
A grudge between two divers whom Mike is testing for underwater mining skills becomes a secondary issue when one of them contracts nitrogen narcosis.
Episode 4
Before Mike can investigate the disappearance of a pair of skin-diving geologists, one turns up dead on the beach bearing marks resembling the suction valves of a giant octopus.
Episode 5
Mike helps the Immigration Department Border Patrol break up an underwater border-running operation.
Episode 6
A beautiful woman hires Mike to give her diving lessons for mysterious reasons.
Episode 7
An attractive magazine photographer hires Mike to assist her in getting pictures of a sunken barge off the coast of Mexico.
Episode 8
Hired to test a new electronic fish-finder, Mike encounters a village where every fish in the vicinity has disappeared.
Episode 9
A pair of ruthless treasure hunters dupes a young skin diver into helping them loot a sunken ship.
Episode 10
Mike dives into the Caribbean to recover the lost nose cone from an ICBM rocket before enemy agents can get it.
Episode 11
A killer whale is capsizing boats and endangering scuba divers and swimmers along a stretch of coastline.
Episode 12
Mike plays commando in rescuing a scientist who had defected from Soviet kidnappers who are returning him to Moscow aboard a Pacific liner.
Episode 13
Mike and two cameramen are imperiled when an irrationally jealous man drops their camera cage into shark-infested waters.
Episode 14
Mike competes with a pair of helmet divers to salvage a German submarine sunk off the coast of South America.
Episode 15
A man claims to have invented a machine that can locate ships carrying gold.
Episode 16
Mike is nearly killed by a massive electrical jolt used by a poacher to kill fish in the Florida Everglades.
Episode 17
Mike comes to the aid of a female escape artist when her underwater stunt goes awry.
Episode 18
Mike interrupts an underwater survey in the Gulf of Mexico in order to save a diver whose air line has become snarled.
Episode 19
Mike supervises a diamond diving expedition in South America, but discovers that his employers are poaching on someone else's property.
Episode 20
A vicious alligator escapes from a wild animal show and takes refuge in the lake of a public park.
Episode 21
An entire Mexican town is menaced by the presence of a derelict floating mine in its harbor that could ignite fumes from the local nitrate factory if it is detonated.
Episode 22
The State of Florida hires Mike to organize and train an underwater police force to deal with a series of underwater crimes.
Episode 23
Mike investigates an underwater grotto said to feature a mermaid that lures men to their deaths.
Episode 24
A professor and his daughter hire Mike to help them search for a rare underwater plant in Costa Rica.
Episode 25
A pair of prospectors hire Mike to trace the source of radioactive fish with a Geiger counter in hopes of finding a uranium deposit.
Episode 26
Mike is hired by a playboy sportsman to supervise their underwater shark ""safari"" in the waters off Peru.
Episode 27
Mike finds a famous rocket scientist being held in an underwater prison by enemy agents.
Episode 28
A frustrated former athlete pushes his children to be Olympic swimmers, resulting in their becoming trapped in a cave by a rising tide.
Episode 29
Mike leads a diving team in rescuing a Latin American diplomat and his family from kidnappers.
Episode 30
Mike and three other survivors share a life raft after a storm capsizes their boats.
Episode 31
Mike's work on a movie prompts a fellow stunt diver to attempt a dangerous record-setting dive.
Episode 32
After locating a leak in a gas line and retrieving a young boy's sunken bicycle, Mike is beaten up and threatened by a gang of thugs.
Episode 33
An underwater camera holds the key to determining whether a woman's drowning was accidental, as her husband claims, or not.
Episode 34
Mike is hired to destroy an underwater offshore peak that is notorious for ripping the hulls out of passing ships.
Episode 35
A group of sportsmen hire Mike to supervise their skin-diving outing, whereupon one of them sneaks off and begins photographing secret Navy facilities.
Episode 36
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.
Episode 37
Mike investigates reports of a sea monster off the coast of Mexico.
Episode 38
The murder of a telephone company employee leads Mike to an underwater cable that is being tapped to access top-secret research Conferences.
Episode 39
Mike discovers an important manganese deposit, but an ambitious young geologist, sharks, and an approaching hurricane threaten to silence him before he can inform the government.
