Three brothers pose as abalone fishermen and hire Mike to teach them to use scuba gear. Mike becomes suspicious, trails the siblings, and discovers their real reason for ...

Mike unwittingly becomes involved in the preparation of an underwater bank robbery. ...

Mike battles saboteurs, while conducting an underwater security check for a rocket fuel plant. ...

Mike battles spies in an underwater maze of caves. ...

Mike signs on as tech adviser to a movie company filming yet another version of The Count of Monte-Cristo. The director wants to shoot the underwater escape of Edmond Dan ...

A woman, who is willing to do anything she can to win, challenges Mike to an underwater race, as a publicity stunt. ...

Mike Nelson is called in on a space project and commissioned to experiment underwater with four top candidates for space travel. ...

Mike Nelson and three of his students search for a missing diver, who was dragged deep below the surface by a large fish that he speared. ...

Mike conducts an emergency covert search in foreign waters to recover a nuclear warhead ditched by a U.S. Air Force plane. A local fishing boat interferes. ...

A beautiful millionairess who was crippled by a mountain climbing accident has her husband and doctor recommend scuba diving as therapy for her legs. Nelson is hired to w ...

Mike conducts a desperate search for survivors soon after a freighter sinks to the bottom of a river in the city of New York. He finds two trapped men and a dog named Tig ...

Mike investigates sabotage of a turbo-electric dam located in a desert area of a small country. ...

Mike takes on a possible suicide mission, when he agrees to swim with a fire hose through an underwater intake pipe into a burning warehouse filled with combustible chemi ...

Nelson passing on an invitation to enjoy a break at Catalina Island instead decides to do some needed maintenance work on his boat. However,he is hired at gunpoint to ret ...

After discovering a lost WWII submarine a scuba diver has a violent seizure. His wife radios for help and Nelson and a friend respond. After giving resuscitation Nelson a ...

Mike helps the police investigate the apparent murders of two divers who were searching for a sunken yacht full of treasure. ...

While looking into the possibility of linking two Latin American lakes by a canal, Mike runs into a group of rebel guerillas. ...

While on a research project, Mike encounters saboteur frogmen attempting to destroy the Panama Canal. ...

A Greek sponge diver and his pretty girlfriend lay a minefield for Mike, fearful that he will interfere with their discovery of a valuable statue on the Mediterranean sea ...

Mike searches for a diver who has just stolen a briefcase filled with top secret papers. ...

Nelson is hired to assist a Geology Professor who has found uranium deposits in an underwater cave. As Nelson is about to enter the cave,a freak underwater landslide trap ...

A champion water-skier drowns during the finale of a water show. ...

Mike takes a husband and wife archaeologists on a cave dive. ...

While on a diving assignment in a foreign country, Mike Nelson unwillingly becomes involved in proving that the country's military ruler is guilty of murdering a member o ...

Shortly after a skin diver steals lobsters from an old fisherman as part of a secret club initiation, he disappears. Mike Nelson finds his spear gun near the lobster pots ...

Mike is recruited to search for hidden stolen liquid explosives. ...

Mike attempts to rescue a kidnapped friend. ...

When a nosecone's capsule fails to eject after landing in the ocean, Mike attempts to locate it and rescue the scientist trapped inside. ...

A female diving student plots revenge after Mike kicks her out of his diving class. ...

Mike Nelson is on assignment to locate narcotics hidden below the waterline of vessels in the harbor. ...

While conducting a visual and photographic survey for a State underwater park, Mike becomes a target for murder. ...

Mike takes part in a daring rescue mission of a woman held prisoner by foreign forces. ...

Mike risks his life to catch pearl thieves off the coast of Hawaii. ...

Mike helps to bust up a murderous alien-smuggling ring. ...

Mike gets involved in recovering stolen six valuable computer memory tapes, which are being held for ransom. ...

Mike attempts to free a salvage diver trapped under a tremendously heavy piece of deck cargo. ...

Mike attempts to rescue a couple inexperienced divers from the deep. ...

A deep sea fisherman and his son arm and plant a World War II mine in an attempt to destroy a kelp harvester. ...

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