Season 4

1961 · 38 episodes

Episodes

1Point of No ReturnMike is trapped in a ""scubasphere"" when the cable attached to it snaps.
2River TreasureWhile surveying a remote river in the South American jungle, Mike is threatened by the jealousy of a man prospecting for emeralds with his wife.
3The DestroyersMike investigates the source of a radar jamming signal that caused two ships to collide.
4Vital ErrorA 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.
5The DancerA scuba diving ballerina faces the possibility of underwater amputation when she catches her foot between the buckled plates of a sunken freighter.
6Sperling of LamatsueAfter 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.
7RescueUnaware that two of his treasure-hunting friends are trapped inside, Mike sets charges to blow up a sunken ship that is a menace to a busy shipping lane.
8Mercy TripMike scouts a path through mine-infested waters so that medical supplies can reach a China Sea port hit by a cholera epidemic.
9Hot TracerMike's efforts to retrieve a pair of radioactive cylinders are complicated by the presence of a headstrong youth to whom he's been giving diving lessons.
10Sonar StoryMike uses sonar to foil a gang of underwater heroin smugglers.
11AmigoA young Mexican boy helps Mike locate a safe entrance to an underwater fossil cave.
12The AquanettesMike faces sharks and other unexpected difficulties while working with three pretty women undergoing astronaut training.
13Survival KitMike is hired by a local German consul to salvage a survival kit from the wreckage of a Nazi warplane in the Caribbean.
14ExpeditionWhile 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 with.
15BionicsMike convinces a reluctant daughter to continue her father's work after he is killed testing an underwater electrical detection device.
16The DefectorA man bribes Mike to continue giving lessons to an inept diving student whom he's stopped teaching.
17NikoMike heads a three-man team in an effort to disarm a pair of unexploded torpedoes at the bototm of a West Coast harbor.
18CougarA restless youth and a college girl complicate Mike's attempts at capturing a poisonous lionfish.
19Sub HatchA 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 the bends from killing him.
20The Octopus StoryMarkings on the body of a dead diver convince a marine biologist that a tropical lagoon is inhabited by a killer octopus.
21QuicksandOne 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.
22Lost IslandMike teams up with a Mexican prison escapee to uncover nefarious activity on an uncharted Pacific atoll off the coast of South America.
23BabyMike 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.
24Confidential MissionMike poses as a tourist on vacation as he tries to locate a hidden underwater missile launcher in the Caribbean.
25Underwater PiratesPirates try to snatch a sunken freighter away from Mike before he can salvage it for an old Navy buddy.
26The MeetWhile working for the U.S. Treasury to break a counterfeiting ring, Mike intercedes in a kidnapping.
27Dark EvilA pretty woman and her father, vacationing in the Bahamas, become killers after inadvertently eating a variety of fish that causes hallucinations.
28Sunken CarA sunken truck points Mike to the murder of a political boss, and the killer is the father of a good friend of Mike's.
29Hit and RunMike goes after an egocentric movie star who injured a friend of Mike's in a hit-and-fun speedboat accident.
30The Saint StoryWhile searching a Latin American harbor for a sunken statue, Mike discovers a UHF homing beacon being used to guide submarines into the port.
31ImpostorA 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 his current top-secret mission.
32SupermanWhile 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 and his insulin supply will be lost with the vessel.
33RoustaboutMike's assistant is trapped underwater by an overturned truck containing drums of poison that could endanger a South American city's water supply.
34P.T. BoatMike helps test a remote control guidance device invented by a rich eccentric.
35Starting SignalA naval officer of a Caribbean nation is sabotaging a series of experiments Mike is conducting with the Coast Guard.
36SkipperDuring hydroplane races, a friend of Mike's rams his craft into a Coast Guard ship, leaving Mike to investigate.
37Crime at SeaMike helps the daughter of his old UDT Commander investigate the man's death, which she believes was murder.
38Round UpMike must find and disarm a torpedo that's been sent into the outflow tube of a hydro-electric plant.