Episode 1
Working for the State Department, Mike attempts to rescue a political prisoner in South America by using a harbor city's canal system.
Episode 2
A swimsuit designer hires Mike to do an underwater fashion shoot, but corporate espionage interferes with the job.
Episode 3
Mike attempts to deal a blow to organized crime by using a periscope camera to photograph a secret meeting of mob bosses at a lakeside estate.
Episode 4
Mike finds high radiation coming from the hull of a foreign freighter, but when the Coast Guard investigates, they find no trace of the radioactivity.
Episode 5
An accidental death puts Mike onto an espionage ring that is using an underwater cave for a microfilm drop site.
Episode 6
Mike and a female health official try to remove a dangerously radioactive capsule from a sunken ship.
Episode 7
Mike, working with a pretty Secret Service agent, poses as a scientist in order to retrieve a cache of counterfeit currency from a crashed Nazi plane off the coast of a Caribbean republic.
Episode 8
Mike finds that someone has tapped the underwater cable used in monitoring a televised missile test.
Episode 9
Mike rescues a diver in the Bahamas, then helps her with her research into the origin of a jade statue she owns.
Episode 10
While on patrol with the Coast Guard Auxiliary, Mike discovers a deported crime boss trying to re-enter the country, then has to rescue him from some old enemies.
Episode 11
Mike leads the way in a salvage operation to recover more than a million dollars' worth of gems from the captain's safe of a sunken ship.
Episode 12
In preparation for the visit of a foreign head of state, Mike helps the Coast Guard do a security check on the area.
Episode 13
A new revolutionary leader asks Mike to help him retrieve his country's hidden gold reserves, believed to have been hidden aboard a scuttled freighter by the ousted former dictator.
Episode 14
While marking underwater sites for demolition by a construction company, Mike learns that a young boy is trapped in a submerged grotto that has already been mined with an explosive.
Episode 15
While supervising an expedition in the Indian Ocean to find a rare coelacanth fish, Mike finds that the organizer is dangerously eager to impress his fiance.
Episode 16
Scientists risk triggering a tidal wave when they ignore Mike's warnings about the strength of the explosive charges they're using.
Episode 17
Mike faces arrows and an alligator in the Mayan jungle while searching for a drug that could be a boon to medicine or a dangerous narcotic.
Episode 18
Mike tries to reach a little girl trapped in the air shaft of a mine located at the edge of a man-made lake, but the potential for a landslide hampers his attempt.
Episode 19
Mike searches for a vanished oceanographer by retracing her charted course.
Episode 20
Mike discovers the wreck of a navy ship that disappeared mysteriously, and is joined by a pair of its former crew members when he dives to examine it.
Episode 21
Mike becomes suspicious when his hired dive on a Spanish galleon yields a rare art treasure.
Episode 22
While diving in Lake Ontario, Mike is sent by the Coast Guard to investigate an item that crashed into the lake nearby, which may be an enemy ICBM.
Episode 23
An East Indian oceanographer vanishes during a series of underwater experiments with infra-red light.
Episode 24
Mike and an old war buddy use a new, untested ""re-breather"" to investigate an underwater missile site being constructed in the channel of a privately-owned island.
Episode 25
Mike helps a friend in the military with his tests of underwater radar equipment.
Episode 26
Mike straightens out a pair of teenagers who poisoned a shark Mike had captured for Marineland.
Episode 27
While helping to test a friend's underwater radio device, Mike discovers a submerged radio beacon, camouflaged and guarded by an electric gun.
Episode 28
A small Latin American country calls upon Mike to help defuse a sunken munitions ship set to blow by saboteurs.
Episode 29
Mike goes after a newlywed teenager turned fugitive after a bungled holdup prompts him to hide in the city's storm drain system.
Episode 30
Mike trains a pair of frogmen for a rescue mission in which they will rescue their kidnapped president from an ancient fortress.
Episode 31
When Mike is called upon to teach scuba diving to his former mentor who trained him in helmet diving, he finds that the older man is not physically up to it.
Episode 32
The Coast Guard asks Mike to investigate the drowning death of a scientist who had invented a new type of rebreather.
Episode 33
A scientific society hires Mike to obtain fossil samples from a newly-discovered underwater cavern for the purpose of authentication.
Episode 34
Mike discovers a plant growing profusely on the ocean floor that turns out to be a hybrid cannabis, and he is speared when he investigates further.
Episode 35
Mike is sent by the government to investigate a jamming signal affecting a listening station in the Indian Ocean.
Episode 36
Another movie company using Mike as an advisor needs his help when a planned torpedo blast traps the star and a Hollywood columnist onboard a sinking ship.
Episode 37
Mike races foreign agents to a missile fired from Central Asia in order to photograph it on the sea bottom and obtain its data recorder.
Episode 38
Mike tries to outmaneuver a foreign harbormaster as he attempts to retrieve a diplomatic pouch from an airliner that crashed into the sea.
Episode 39
Mike responds to a ""man overboard"" situation, but an extensive search turns up no victim.
