1958

S4.E1 ∙ Point of No Return

Fri, Jan 06, 1961

As part of a research project, Mike Nelson attempts to spend three days underwater at a depth of 250 feet in a pressure chamber dubbed Scubasphere. A tropical storm pops up, and both the cable and telephone connections attached to the Coast Guard ship above are severed. To make matters worse, the ship heads for safer waters without realizing that Mike has lost his connection to them.

8.3 /10

S4.E2 ∙ River Treasure

Fri, Jan 13, 1961

While in a South American jungle, Mike tangles with a jealous treasure hunter.

7.5 /10

S4.E3 ∙ The Destroyers

Fri, Jan 20, 1961

Mike investigates the mysterious collision of two Navy destroyers.

7.9 /10

S4.E4 ∙ Vital Error

Fri, Jan 27, 1961

Mike's normally level-headed skindiving buddy begins to exhibit peculiar behavior.

7.1 /10

S4.E5 ∙ The Dancer

Fri, Feb 03, 1961

Mike desperately tries to save the life and limb of a popular dancer whose leg is hopelessly pinned in wreckage 90 feet below the surface.

8.7 /10

S4.E6 ∙ Sperling of Lamatsue

Fri, Feb 10, 1961

Mike tries to recover valuable medical supplies that an Asiatic warlord has dumped into the river.

7.4 /10

S4.E7 ∙ Rescue

Fri, Feb 17, 1961

Mike must dive to rescue a friend trapped in a sunken wreck, with just minutes left until explosive charges are set to blow it to pieces.

8.4 /10

S4.E8 ∙ Mercy Ship

Fri, Feb 24, 1961

Mike risks his life in order to sneak badly needed medical supplies through a dictator's mine-infested blockade.

8.5 /10

S4.E9 ∙ Hot Tracer

Fri, Mar 03, 1961

Problems arise as Mike attempts to retrieve a pair of radioactive cylinders leaking dangerous amounts of radiation underwater.

7.9 /10

S4.E10 ∙ Sonar Story

Fri, Mar 10, 1961

Using sonar equipment on his boat, Mike tracks heroin smugglers.

8.2 /10

S4.E11 ∙ Amigo

Fri, Mar 17, 1961

Mike travels to Mexico in search of underwater fossils in an inaccessible cave.

8.2 /10

S4.E12 ∙ The Aquanettes

Fri, Mar 24, 1961

Mike takes part in a special program known as Operation Astronette. His job is to train three female astronauts in underwater survival skills.

6.9 /10

S4.E13 ∙ Survival Kit

Fri, Mar 31, 1961

Mike attempts to salvage a survival kit from a German fighter plane shot down during World War II.

8.1 /10

S4.E14 ∙ Expedition

Fri, Apr 07, 1961

Professor Halliday wants more money to carry on his underwater exploration.

8.8 /10

S4.E15 ∙ Bionics

Fri, Apr 14, 1961

An inventor dies while testing a new underwater detection device.

8.1 /10

S4.E16 ∙ The Defector

Fri, Apr 21, 1961

Mike tells an inept skin-diving pupil that there's no point in continuing his lessons.

8.4 /10

S4.E17 ∙ Niko

Fri, Apr 28, 1961

Mike attempts to diffuse two sunken torpedoes, as well as diffusing the racial tensions between the Japanese and American members of his 3-man team.

7.9 /10

S4.E18 ∙ Cougar

Fri, May 05, 1961

Mike and a young man, whom he had helped rehabilitate when he was a juvenile delinquent, fly to Hawaii to hunt for lionfish, one of the most venomous fish on the ocean floor.

7.6 /10

S4.E19 ∙ Sub Hatch

Fri, May 12, 1961

Mike and his partner fight the bends, as they endure a long recovery process in a submarine's escape trunk.

8 /10

S4.E20 ∙ The Octopus Story

Fri, May 19, 1961

Mike and his diving team are attacked by a violent new breed of octopus.

7.8 /10

S4.E21 ∙ Quicksand

Fri, May 26, 1961

While searching for a sunken wreck, Mike's hard hat diving partner disappears, leaving nothing behind but his torn air hose attached to their boat on the surface.

8.3 /10

S4.E22 ∙ Lost Island

Fri, Jun 02, 1961

While on a covert mission for the U.S. Government, Mike discovers a few unsavory inhabitants on what was supposedly a deserted island.

7.6 /10

S4.E23 ∙ Baby

Fri, Jun 09, 1961

While in the dangerous jungles of Ecuador, Mike takes desperate measures to save the life of his very ill infant godson.

7.7 /10

S4.E24 ∙ Confidential Mission

Fri, Jun 16, 1961

Mike travels undercover to the Caribbean Coast on a secret mission for the United States Government.

8.3 /10

S4.E25 ∙ Underwater Pirates

Fri, Jun 23, 1961

It's a battle of wits, as Mike tries to outsmart pirates intent on hijacking the cargo of a sunken wreck that he found.

7.6 /10

S4.E26 ∙ The Meet

Fri, Jun 30, 1961

Mike is recruited to track down counterfeiters.

7.1 /10

S4.E27 ∙ Dark Evil

Fri, Jul 07, 1961

While Mike is in Nassau on a salvage job, two of his friends catch and eat a strangely poisonous fish for breakfast, which causes severe hallucinations that trigger suicidal and homicidal tendencies.

7.4 /10

S4.E28 ∙ Sunken Car

Fri, Jul 14, 1961

After being falsely arrested for diving in a bay, Mike sets out to solve a murder mystery.

8.1 /10

S4.E29 ∙ Hit and Run

Fri, Jul 21, 1961

A female diving friend of Mike's is hospitalized with severe injuries sustained by a hit-and-run speedboat piloted by a popular movie star.

7.6 /10

S4.E30 ∙ The Saint Story

Fri, Jul 28, 1961

Mike is recruited to rescue the statue of a Saint who falls off a ship into the sea. The locals believe this is the cause of many problems in the area including the poor fishing.

8 /10

S4.E31 ∙ Imposter

Fri, Aug 04, 1961

Mike is suspected of insurance fraud, after an impostor steals a valuable necklace.

7.6 /10

S4.E32 ∙ Superman

Fri, Aug 11, 1961

Mike is invited to join a longtime friend and her workaholic husband on their expedition to explore an Aztec ceremonial pool on an uninhabited island located 15 miles off the coast of Mexico. Mike's friend unwittingly puts her husband's life in jeopardy, when she deliberately strands the trio on the island.

7.9 /10

S4.E33 ∙ Roustabout

Fri, Aug 18, 1961

A South American city's water supply is threatened by a drum of poison from an overturned truck.

7.9 /10

S4.E34 ∙ P.T. Boat

Fri, Aug 25, 1961

While vacationing in Nassau, Bahamas, Mike meets an eccentric multi-millionaire inventor and his sister. He helps the man experiment with an underwater remote control device used to guide boats.

7.6 /10