Mike Nelson sets out to prove that the death at sea of a friend's father was the result of murder. ...

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

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

Sabbateurs have rigged a sunken ship with 50 tons of dynamite, and it's Mike's job to diffuse the monstrous time-bomb before it blows up an entire foreign nation's capita ...

Mike attempts a risky rescue of a young girl trapped inside an underwater mine. ...

Mike's assignment: Retrieve a deadly radioactive capsule and restore it to a lead container without exposing himself to gamma radiation that could take his life. ...

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

Mike attempts to rescue a kidnapped friend. ...

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

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

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

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 ...

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

While off the coast filming whales, Mike and his boat-mate learn another guided missile expert has disappeared in the area. Investigating suspicious activity by some dive ...

To fund research for an ocean plants into food products project, Nelson agrees to travel to Puerto Blanco/South America. There he teaches skin diving to a thrill seeking ...

Two prospectors (one of whom is at times violently paranoid about being cheated) ask Nelson to join them in a search for uranium deposits in a river bottom. When after tw ...

A professor and his daughter hire Mike to harvest a rare underwater plant from a South American lake. The anxious old man joins Mike for the dive, comes up too quickly, a ...

Mike Nelson travels from his home base of Marineland, California to Silver Springs, Florida. There he trains a pair of Florida Highway Patrolmen in scuba diving so as to ...

Mike Nelson goes after a vicious alligator that escapes from a wild-animal show in Silver Springs, Fla. and takes refuge in the lake in a public park. ...

Nelson,in Florida and in the early stages of testing an underwater listening device (a Hydraphone),sidetracks to Panama to train scuba diving to two geologists.The geolog ...

Mike assists the authorities in trying to apprehend a poacher operating in the swamps of Silver Springs, Florida. ...

Mike travels 1500 miles inland to a flooded mine where two men are trapped in a foul air pocket. He reaches them, but his dilemma is that there is only enough air in his ...