Jorge Alquiero hires Primus for a dangerous underwater job. Primus dives after an oceanographer stranded on the ocean floor. But the assignment is hindered by a Benton's plan to steal his sophisticated equipment to look for a treasure. Primus is retained for a dangerous underwater operation involving explosives. When one diver is injured. Primus devises a robot to complete the assignment with disastrous results.
Danger from underwater explosives, a robot and a sunken liner. Nicola, a photographic model and a woman's-lib advocate, is determined to attempt a dangerous dive. Nicola steals an untested underwater breathing device that has been altered and is lethal if used.
While studying ocean life off the island of Mangaya, Primus is precipitated into the quicksands of political intrigue. While investigating the disappearance of all fish life off the island of Mangaya Primus becomes involved with the kidnapping of an American Ambassador.
A deep sea scientist is stung by a scorpion fish to which he is highly allergic and becomes incapacitated on the depths of the ocean floor.
Routine bank robbers plot with a new twist: the getaway is planned on a submarine. A former employee of Primus pulls a bank robbery then tries to steal his submarine.
An underwater narcotics operation is the bugaboo for Carter. Primus must break-up this narcotics
organizations' underwater refining and delivering of heroin.
Sunken canisters of deadly phosphorus provide the suspense in this adventure. The canisters are carried by currents from a sunken barge.
The drama in this episode is provided by an inferno of an offshore drilling rig. An electrical storm causes a gigantic explosion aboard the rig. When the off-shore oil-drilling platform catches on fire, Carter tries to rescue a trapped friend.
Undersea sabotage is the problem faced by Carter. Primus investigates when oil piped from a tiny Arabian nation mysteriously disappears before it reaches its destination.
An astronaut (Guy Stockwell) goes berserk in an underwater test chamber. Three astronauts spend 60 days in an undersea habitat and begin to show signs of stress.
A case of the bends strikes a diver scientist. To aid the son of a Greek shipping magnate trapped in the wreck of a sunken World War II vessel, Primus swims to the rescue with on underwater torch, only to discover the man plans to use it in a robbery.
An erupting volcano endangers an underwater archaeological expedition.
At first it looks like a simple youthful prank when Primus captures three college students while stealing Primus’ portable sub the Shark Hunter. But the students hide a more serious purpose in mind: to lock themselves to the waste pipe of a nearby chemical plant. Will Primus help save the kids, or will he help them save the environment?
In this episode, Primus is dogged by a sniper. Primus helps a community whose important economic resource, a phosphate plant, is also its greatest liability, the most deadly cause of polution, killing all fish in the town's river.
Primus unravels a mystery involving the disappearance of an experimental torpedo. Carter Primus is called to recover a live experimental torpedo which has sunk to the bottom of the ocean off the west coast of Cuba.
Primus must locate a plane that crashed into the sea with a payload of diamonds. A plane crashes into the ocean with a payload of $7,000,000 worth of industrial diamonds. Insurance investigator Derek Simpson (Lloyd Bochner) commissions Carter Primus (Robert Brown) to locate the wreckage. He finds it, but so does an unidentified submarine, which attacks Primus at the underwater site.
Foiling a museum heist leads Primus on an underwater chase. Primus is commissioned to guard a museum filled with priceless treasures. The museum is located near the sea and while Primus and his assistant attempt to install infrared devices underwater, they are trapped by a steel net..
A whirlpool turns into a danger factor for Primus and other divers. Carter Primus hires professional skin divers to locate a boat which disappeared mysteriously. A whirl pool sucks them into an underwater cave. Searching for the divers, Primus and Tom Hayden fall into the whirlpool.
While Primus and Toni train three divers, one receives a gash from the sunken wreckage they're exploring and a school of 200 sharks is attracted by the blood! A school of sharks attacks a wounded diver trainee.
Drama about efforts to save the diver trapped by sharks. In this concluding episode a school of sharks surrounds a diving mission led by Primus and injures one diver. While Primus surfaces for medical aid and fresh air supply, the divers seek refuge in a sunken wreckage.
A man stricken with nitrogen narcosis disappears into a shapeless eerie ocean mass. Primus swims to investigate. Bill Bolton, an ex-frogman(Dan Chandler) is dying in an underwater habitat. The only doctor who can perform a tracheotomy to save him, has never made a descent. Carter Primus (Robert Brown) and Charlie Kingman (Will Kuluva) guide the doctor (Mike Road) 320 feet undersea, but the doctor develops nitrogen narcosis and Primus must perform the tracheotomy himself.