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

Mike must find and disarm a torpedo that’s been sent into the outflow tube of a hydro-electric plant.

A naval officer of a Caribbean nation is sabotaging a series of experiments Mike is conducting with the Coast Guard.

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

While on a diving expedition in Guatemala, a woman seeking to slow down her husband’s frantic lifestyle deliberately sinks the boat they share, unaware that her husband is a diabetic…

A dead ringer for Mike is stealing diamonds from a sunken sports cruiser, but when Mike is accused of the crime, he is unable to establish an alibi due to…

While searching a Latin American harbor for a sunken statue, Mike discovers a UHF homing beacon being used to guide submarines into the port.

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

Mike must get past Jivaro Indians who are blocking his passage downriver as he attempts to get a young missionary’s baby to a hospital for medical attention.

Mike teams up with a Mexican prison escapee to uncover nefarious activity on an uncharted Pacific atoll off the coast of South America.

Markings on the body of a dead diver convince a marine biologist that a tropical lagoon is inhabited by a killer octopus.

One salvage diver disappears while diving on a sunken yacht off the coast of Yucatan, and Mike tries to see that two others don’t share his fate.

A heroic test pilot from the Korean War has his mettle tested when he must spend 24 hours with Mike in a makeshift decompression chamber after a dive to prevent…

Mike heads a three-man team in an effort to disarm a pair of unexploded torpedoes at the bototm of a West Coast harbor.

A restless youth and a college girl complicate Mike’s attempts at capturing a poisonous lionfish.

A man bribes Mike to continue giving lessons to an inept diving student whom he’s stopped teaching.

While helping his former history professor search for pirate treasure off the North Carolina coast, Mike finds evidence that the underwater cave said to house the treasure has been tampered…

Mike is hired by a local German consul to salvage a survival kit from the wreckage of a Nazi warplane in the Caribbean.

Mike faces sharks and other unexpected difficulties while working with three pretty women undergoing astronaut training.

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

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

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

After being accidentally caught in a fishing net, Mike challenges an Asiatic warlord by trying to retrieve a cache of medical supplies that the dictator has dumped into a river.

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…

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

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.

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

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

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 foreign agents to a missile fired from Central Asia in order to photograph it on the sea bottom and obtain its data recorder.

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

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.

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

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

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.

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

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

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.

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