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

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

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

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

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

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

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

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

Mike attempts to rescue a kidnapped friend. ...

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

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 ...

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 ...

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

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

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 ...

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

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 ...

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

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

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

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 ...

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 ...

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 ...

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

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 ...

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 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. ...

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

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

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 ...

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