Seasons & episodes

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

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

S3 · E22Target 1960-06-04＋

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.

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

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 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.

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

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

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.

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

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

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

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

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.

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