Ex-Navy Underwater Demolition Team Officer Mike Nelson continues his skin-diving as a postwar profession...combining mastery of the scuba and spear with a flair for dangerous investigation.
Cinematographer: Lamar Boren
Producer: Ivan Tors
Producer: Frederick Ziv
The Manganese Story: Fighting sharks and an approaching hurricane, Mike Nelson and a young geologist discover a field of pure manganese - a vital metal to national defense - on the ocean floor. The geologist, insane with greed, tries to kill Mike Nelson and claim the discovery as his own.
Ghost Lite: An East Indian oceanographer vanishes during a series of underwater experiments with infra-red light.
The Alcatraz Story: Three brothers hire Mike Nelson to give them SCUBA instructions. Their secret purpose for the lessons: a daring underwater attempt to free a fourth brother from Alcatraz, the 'unbreakable' island prison. Mike discovers the plot, then uses his two fists to smash it.
Underwater Labyrinth: An electronic test boat sinks during a Florida hurricane, taking a newly-developed guided missile tracker with it to the bottom of the sea. Mike Nelson, hired to recover the invaluable equipment, discovers skindiving thieves have already made off with it. Mike overtakes the thieves and outfights them in a fierce land and sea battle.
Monte Cristo: A movie company is shooting the famous scene from 'The Count of Monte Cristo' in which Edmond Dantes escapes prison by being thrown into the sea in a burial sack. The producer hires Mike Nelson to assist the movie star and his stand-in in the perilous underwater sequence. Mike discoveres the star's recklessness and the stand-in's jealousy are leading to disaster. Mike Nelson expertly supervises the perilous sequence -- and saves a man's life.
The Stunt: Mike accepts the challenge of Blaze Green, an expert female swimmer, to race underwater from the California coast to Catalina Island. Blaze -- hungry for the publicity she'll get if she beats Mike -- pits trickery against Mike's superior underwater skill. Then she recklessly courts disaster by swimming into a furious subsurface storm. Mike executes a daredevil plunge into the turbulence to reach Blazem saver her life -- and his own.
Diving For The Moon: Mike takes a group of future space pilots to the bottom of the sea, where many survival problems are similar to those encountered in outer space. But a sudden hurricane washes their boat away, stranding them underwater. Mike leads a struggle against cold, panic and lurking sharks to avert disaster.
The Search: When a scuba diver is dragged under by a fish he had speared, Mike dives to the rescue. He finds that the victim is held fast in a treacherous kelp forest, a tangled mass of jungle-like undergrowth with ghostly branches and fronds -- each one a moving trap. Mike Nelson invades the dark, clutching corridors of the undersea menace to find his man and bring him to the surface.
Jettisoned: During a hurricane, an Air Force bomber is forced to 'ditch' an unarmed nuclear bomb off the coast of South America. Sea water corrodes the bomb casing, threatening at any moment to trigger a gigantic explosion. Mike's perilous assignment: find the bomb and recover it before it goes off! Mike Nelson overcomes unexpected obstacles in a desperate attempt to complete his mission in time.
Underwater Security: On a government assignment, Mike Nelson tests the security of underwater approaches to an oceanside rocket fuel plant. At the mouth of a tunnel leading to the very heart of the plant, he captures two saboteurs -- but only after they have fired a delayed action torpedo into the tunnel! Mike daringly risks his life to swim into the tunnel and disarm the deadly projectile.
Murder At 60 Feet: Mike is hired to teach SCUBA diving to Paul Garrick's wife, supposedly in the hope that water therapy will restore her paralyzed legs. Actually, Garrick is setting up a murder with a treacherous, powerful weapon -- the swirling underwater current of Drake's Cover, off the California coast. Mike Nelson engages in a furious battle with Garrick to prevent the crime and save Mrs. Garrick.
Air Pockets: A freighter sinks to the bottom of New York harbor, with all hands. The ship's owner believes some of the crew might still be alive in air locked inside the vessel. He calls Mike Nelson in for emergency action. Mike descends, and is trapped in a flooded cabin. Mike Nelson saves his own life and struggles to rescue two survivors.
The Dam: Checking the underwater security of a newly-constructed turbo-electric dam, Mike Nelson discovers dynamite set in one of the intake valves. He races against time to catch the saboteurs and save the dam from explosive destruction. Mike subdues the underwater saboteurs before they can fire the deadly charge.
Dock Fire: Flames from a fierce dock fire approach a chemical suppy building on a city's waterfront. A gigantic explosion is almost certain to rip the entire city apart. With the building already cut off by fire, Mike Nelson attempts an almost suicidal task: swim into the buidling through an underwater intake pipe and douse the chemicals in water. Mike, with an entire city at stake, braves the roaring inferno.
The Persuaders: Smugglers receive narcotics shipments via a fishing boat, which drops the contraband cargo off the coast, in sixty feet of water. At the point of a gun, they force Mike Nelson into a treacherous bargain: locate the narcotics container and retrieve it from the ocean floor --- or die. Mike puts an ingenious but risky plan into action in an effort to scuttle the smuggling operation.
Nerve Gas: After coming upon a Japanese submarine sunk during World War II, amateur skindiver Gerald Wiley goes suddenly beserk and tries to strangle his wife before falling into mysterious unconsciousness. Called to the pair's assistance, Mike, while applying artificial respiration to Wiley, also goes strangely berserk and after a fierce struggle with his partner regains consciousness in a hospital. There he tells Mike the reason for his uncontrolled behavior -- a shipment of deadly nerve gas is seeping out of the sunken submarine. Mike makes a daring attempt to find and destroy the invisible menace.
Strange Salvage: Two divers make an exciting discovery on the ocean floor: the wreck of the 'Seawind,' a luxury yacht which sank with a magnificent jewel collection aboard during a storm. But Lou Martin spots the divers and drowns them to protect his interests in the yacht which he found first and has systematically looted ever since. Investigating the drownings, Mike tracks down Martin -- and thus puts his life in danger. Mike falls into an underwater trap laid by Martin and fights for his life.
Underwater Survey: While on assignment to examine the possibilities of a canal which would connect two Latin American lakes, Mike is fired upon by rebel guerillas. After further examination of the lakes, he learns the reason for his jeopardy -- a huge cache of arms and ammunition hidden in a cave. Knowing Mike's discovery could expose preparations for a military revolution, the rebels rush to destroy Mike. Mike fights two dangers; bullets and drowning.
Underwater Curtain: Testing an invention off the Panama coast, Mike and two companions discover a mysterious submarine discharging a group of frogmen. The frogmen start an underwater survey and it becomes apparent that they are preparing a launching pad for a ballistitic missle. Their target: the Panama Canal. In moral peril, Mike's party makes a desperate attempt to send out a warning signal to the Coast Guard. Mike makes a near-suicidal attempt to steal previous radio equipment from the enemy camp.
Hermes: Greek sponge-diver Elias Staros and his girlfriend Cara find a valuable antique statue on the floor of the Mediterranean Sea. Afraid Mike will interfere, they rig the area with booby-trap mines. When Mike catches them trying to move the statue, Staros is killed by one of his own mines and Cara makes a desperate attempt to kill Mike.
The Briefcase: John Bentham, anxious to get secret missile data for personal profit, lures a government scientist onto a boat. Bentham 'accidently' drops the scientist's data-filled portfolio into the water, where one of his skindiving hirelings waits to snatch it away. Mike Nelson gets an emergency call: Find the vital papers -- and find them fast! Mike pits his underwater skill against the ingenious theft plot.
Cave Diving: While searching for uranium deposits in an underwater cave, geologist George Bryan is trapped in a sudden landslide which pins a massive rock to the cave enterance. Racing against time, Mike tries heroically to pull the rock away which the aid of hooks and cables. But the implacable stone threatens to become Bryan's tombstone! Mike borrows a Navy Seabee trick in a last desperate effort to move the rock.
Water Ski Show: Joe Ross, featured performer in a water ski show, drowns during the underwater finale to the new act. Mike investigates, learns an unidentified SCUBA diver was spotted near the death scene. He also learns from Ross's bereaved girlfriend that her vengeful ex-husband jealously raged over her association with Ross. Mike meets the killer in a fierce underwater struggle.
Underwater Shrine: Mike and a husband-wife archaeology team search for underwater caves in the Caribbean. Imperilled by a deadly network of booby traps, the trio learns that islanders set the traps to guard a cave filled with ancient Mayan treasures. When the archaeologist's wife enters the cave, the hostile islanders seal her in...Mike speeds to her rescue. Mike Nelson finds help from the islanders themselves in his bold rescue attempt.
Chain Of Evidence: Latin American revolutionists seek Mike's help in overthrowing their country's ruthless dictator. They ask him to recover the body of the dictator's murdered opponent from the bottom of the palace lagoon. This incriminating evidence will spark a full-scale revolt. Before Mike can make his decision, a second vicious murder strikes the ranks of the rebels. Mike Nelson's skindiving prowess brings justice to the beleagureed citizenry.
Treasure Hunt: A young skindiver steals lobsters from an elderly fisherman as an initiation stunt. Shortly thereafter the boy's found murdered. The police immediately arrest the fisherman. But on the ocean floor, Mike Nelson finds a vital clue to the real killer. Plunging into danger, Mike fights to solve a murder mystery.
Sea Serpent: Mike, on an archaeology expedition in Arabia, learns a shipment of liquid explosives has been stolen en route to an American guided missile base. Simultaneously, terrified Arabians relate tales of a gigantic 'sea serpent' in the vicinity. Mike dives to investigate and makes a startling double discovery. Mike's underwater revelations expose a cunning plot.
The Big Dive: A stunt man trying to break the world's skin diving record falls victim to the numbing cold and unbearable sea pressures. Mike Nelson descends to a greater depth than ever before to rescue the reckless actor.
Underwater Park: Mysterious attackers attempt to take Mike's life while he's reconnoitering the proposed site of an underwater marine preserve. After three narrow escapes from death, Mike follows a vital clue -- right on the shore approach of a well-hidden gambling establishment. The murder attempts, Mike realizes, happened because public use of the area would strangle the gambling operation. Mike couples skill with bravery in a one-man attack on murderous racketeers.
Underwater Unit: Mike heads a band of three crack skindivers who have been handed a secret, highly-dangerous mission: rescue an anti-Communist woman from a Red concentration camp on the coast of Albania. Swimming 'under' the Iron Curtain, the trio locates the camp and finds it ringed with deadly gun emplacements. Mike Nelson, at the head of a daring rescue team, battles crushing odds in a dash for freedom.
Proof Of Guilt: A beautiful Hawaiian girl is harassed by skindiving thieves who are robbing her underwater cultured-pearl beds. Mike agrees to help her and.adventure and legendary thrills ensue.
Chained: Immigration authorities ask Mike to assist them in a risky mission: they plan to slip one of thier men, Ben Tempesta, among aliens to be sneaked ashore by a smuggling ring, thus gaining the evidence needed to blow the ring wide open. Since the smugglers dump the unsuspecting aliens overboard when in danger of Coast Guard detection, Mike's skindiving talents are needed to save Tempesta from a similar fate. Mike, in a dazzling display of underwater heroics, aids a vital government mission.
Ransom: A husband-wife robbery team makes a million dollar haul: six of the fabulous 'Memory Tapes' which are the heart of a plant's electronic computer system. When the owner of the plant obeys the thieves' demand to toss a waterproof box containing $100,000 in ransom money into a canal, Mike Nelson races into action to nab the thieves and recover the precious tapes. Mike's shrewd detective work, combined with his famous skindiving prowess, tracks down a pair of ultramodern criminals.
Oil Island: An amateur salvage diver carelessly examines a sunken freighter, causing a two-ton spool of heavy lead cable to roll down the deck. It rolls over his legs and pins him down. Mike Nelson responds to the emergency call and twice tries removing the weight - but both efforts prove futile. The pinned victim faces a grim escape via amputation. Mike hits upon a desperate eleventh-hour measure, then risks his life in the effort to save another.
Base Of Operations: Harry and Norma Hervey, the famed man-and-wife news-camera team, plan to dive to photograph a sunken ocean liner. They disregard Mike Nelson's warning that they're inviting almost certain death in danger infested waters. Eager for a news scoop, the pair descend. Physically unprepared for the pressures of the deep, they soon find themselves in serious danger. Mike uses a novel underwater device in a race to save two lives.
Kelp Forest: A coastal fisherman wages a private war against kelp harvesters in his area. He believes they are gathering the underwater foliage for research and ruining the fishing grounds from which he makes his living. The private war erupts into a switch-blade fight. Then the fisherman has a diabolical scheme to destroy the kelp harvesters' boat with a mine, but Mike steps in to prevent a tragedy. Mike lunges at the triggered spikes of an underwater mine.
The Raft: Fog claims a freighter, which strikes a reef and goes to the bottom of the sea with a highly-explosive cargo of liquid nitro in its hold. Fearing the explosives will float away from the crumbling vessel and endanger shipping lanes, the owner of the freighter calls on Mike Nelson. Mike takes on the near-suicidal mission of diving into the ship's hold and detonating the nitro with delayed-action fuses. Mike, placing the safety of the sea lanes before his own life, heroically dives into danger.
Asylum: Working for the State Department, Mike attempts to rescue a political prisoner in South America by using a harbor city's canal system.
Water Nymphs: A swimsuit designer hires Mike to do an underwater fashion shoot, but corporate espionage interferes with the job.
Mister Big: Mike attempts to deal a blow to organized crime by using a periscope camera to photograph a secret meeting of mob bosses at a lakeside estate.
Hot Cargo: Mike finds high radiation coming from the hull of a foreign freighter, but when the Coast Guard investigates, they find no trace of the radioactivity.
Underwater Drop: An accidental death puts Mike onto an espionage ring that is using an underwater cave for a microfilm drop site.
Cobalt Bomb: Mike and a female health official try to remove a dangerously radioactive capsule from a sunken ship.
Counterfeit: Mike, working with a pretty Secret Service agent, poses as a scientist in order to retrieve a cache of counterfeit currency from a crashed Nazi plane off the coast of a Caribbean republic.
Missile Watch: Mike finds that someone has tapped the underwater cable used in monitoring a televised missile test.
Jade Cavern: Mike rescues a diver in the Bahamas, then helps her with her research into the origin of a jade statue she owns.
Expatriate’s Return: While on patrol with the Coast Guard Auxiliary, Mike discovers a deported crime boss trying to re-enter the country, then has to rescue him from some old enemies.
Strong Box: Mike leads the way in a salvage operation to recover more than a million dollars' worth of gems from the captain's safe of a sunken ship.
The Fearmakers: In preparation for the visit of a foreign head of state, Mike helps the Coast Guard do a security check on the area.
Revolutionary Spoils: A new revolutionary leader asks Mike to help him retrieve his country's hidden gold reserves, believed to have been hidden aboard a scuttled freighter by the ousted former dictator.