A killer whale is capsizing boats and endangering scuba divers and swimmers along a stretch of coastline.

Mike is hired by a playboy sportsman to supervise their underwater shark ""safari"" in the waters off Peru.

A beautiful woman hires Mike to give her diving lessons for mysterious reasons.

An underwater camera holds the key to determining whether a woman's drowning was accidental, as her husband claims, or not.

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.

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.

Mike is hired to destroy an underwater offshore peak that is notorious for ripping the hulls out of passing ships.

Mike competes with a pair of helmet divers to salvage a German submarine sunk off the coast of South America.

Mike dives into the Caribbean to recover the lost nose cone from an ICBM rocket before enemy agents can get it.

While investigating the cause of a mine flood that killed thirty men, Mike stumbles upon an air pocket with two survivors.

A grudge between two divers whom Mike is testing for underwater mining skills becomes a secondary issue when one of them contracts nitrogen narcosis.

Mike helps the Immigration Department Border Patrol break up an underwater border-running operation.

Pirates try to snatch a sunken freighter away from Mike before he can salvage it for an old Navy buddy.

A man claims to have invented a machine that can locate ships carrying gold.

Mike plays commando in rescuing a scientist who had defected from Soviet kidnappers who are returning him to Moscow aboard a Pacific liner.

Hired to test a new electronic fish-finder, Mike encounters a village where every fish in the vicinity has disappeared.

Mike and three other survivors share a life raft after a storm capsizes their boats.

A pair of ruthless treasure hunters dupes a young skin diver into helping them loot a sunken ship.

Mike searches for a vanished oceanographer by retracing her charted course.

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

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.

A group of sportsmen hire Mike to supervise their skin-diving outing, whereupon one of them sneaks off and begins photographing secret Navy facilities.

A pair of prospectors hire Mike to trace the source of radioactive fish with a Geiger counter in hopes of finding a uranium deposit.

Mike investigates an underwater grotto said to feature a mermaid that lures men to their deaths.

Mike supervises a diamond diving expedition in South America, but discovers that his employers are poaching on someone else's property.

Mike is nearly killed by a massive electrical jolt used by a poacher to kill fish in the Florida Everglades.

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.

While testing the coastal security of a rocket fuel plant, Mike discovers a pair of saboteurs.

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.

Mike comes to the aid of a female escape artist when her underwater stunt goes awry.

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

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

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

Mike investigates reports of a sea monster off the coast of Mexico.

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.

A vicious alligator escapes from a wild animal show and takes refuge in the lake of a public park.

A professor and his daughter hire Mike to help them search for a rare underwater plant in Costa Rica.

Mike helps the daughter of his old UDT Commander investigate the man's death, which she believes was murder.

Mike's assistant is trapped underwater by an overturned truck containing drums of poison that could endanger a South American city's water supply.

A pretty woman and her father, vacationing in the Bahamas, become killers after inadvertently eating a variety of fish that causes hallucinations.

While working for the U.S. Treasury to break a counterfeiting ring, Mike intercedes in a kidnapping.

A young Mexican boy helps Mike locate a safe entrance to an underwater fossil cave.

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.

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.

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.

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

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.

A scientific society hires Mike to obtain fossil samples from a newly-discovered underwater cavern for the purpose of authentication.

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

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.

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.

Mike is sent by the government to investigate a jamming signal affecting a listening station in the Indian Ocean.

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.

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

A swimsuit designer hires Mike to do an underwater fashion shoot, but corporate espionage interferes with the job.

An East Indian oceanographer vanishes during a series of underwater experiments with infra-red light.

While helping to test a friend's underwater radio device, Mike discovers a submerged radio beacon, camouflaged and guarded by an electric gun.

Mike goes after a newlywed teenager turned fugitive after a bungled holdup prompts him to hide in the city's storm drain system.

Mike trains a pair of frogmen for a rescue mission in which they will rescue their kidnapped president from an ancient fortress.

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.

The Coast Guard asks Mike to investigate the drowning death of a scientist who had invented a new type of rebreather.

Mike responds to a ""man overboard"" situation, but an extensive search turns up no victim.

Mike investigates the source of a radar jamming signal that caused two ships to collide.

Mike finds that someone has tapped the underwater cable used in monitoring a televised missile test.

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.

Mike is trapped in a ""scubasphere"" when the cable attached to it snaps.

While surveying a remote river in the South American jungle, Mike is threatened by the jealousy of a man prospecting for emeralds with his wife.

A famous newsman, convinced that he has a fatal illness, tries to end his life in such a way that his wife can collect his insurance, with Mike as a witness.

Mike scouts a path through mine-infested waters so that medical supplies can reach a China Sea port hit by a cholera epidemic.

Mike uses sonar to foil a gang of underwater heroin smugglers.

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

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

Working for the State Department, Mike attempts to rescue a political prisoner in South America by using a harbor city's canal system.

An accidental death puts Mike onto an espionage ring that is using an underwater cave for a microfilm drop site.

Mike and a female health official try to remove a dangerously radioactive capsule from a sunken ship.

Mike rescues a diver in the Bahamas, then helps her with her research into the origin of a jade statue she owns.

In preparation for the visit of a foreign head of state, Mike helps the Coast Guard do a security check on the area.

Mike becomes suspicious when his hired dive on a Spanish galleon yields a rare art treasure.

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.

Mike helps a friend in the military with his tests of underwater radar equipment.

Mike straightens out a pair of teenagers who poisoned a shark Mike had captured for Marineland.

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.

Mike tries to outmaneuver a foreign harbormaster as he attempts to retrieve a diplomatic pouch from an airliner that crashed into the sea.

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

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

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

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

Scientists risk triggering a tidal wave when they ignore Mike's warnings about the strength of the explosive charges they're using.

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.

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.

A small Latin American country calls upon Mike to help defuse a sunken munitions ship set to blow by saboteurs.

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.

A scuba diving ballerina faces the possibility of underwater amputation when she catches her foot between the buckled plates of a sunken freighter.