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

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

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 investigates the murder of a diver who maintained an underwater phone cable connecting a chemical company with the mainland. He discovers the wire is being tapped to ...

Mike investigates reports of a sea monster, which is literally causing whales to leap into the air above the ocean's surface. ...

Mike investigates a sunken freighter for an insurance company and to search for an earlier diver who never resurfaced. The salvage ship operator he hires to transport him ...

Avalon Air hires Mike for the easy job of watching over a group of competent sports divers he knows well. Joining them is one stranger, George Peterson, who goes missing ...

Mike is called to Canada by an engineering firm to destroy Killer Rock, an underwater peak that has caused many ships to sink and hundreds to die. The chief engineer of t ...

The police ask Mike for his thoughts on a man whose wife didn't resurface after photographing a shipwreck. The husband says she simply went deeper than she could handle. ...

After finishing up a job, Mike retrieves the bicycle of young Jimmy who lost it off the pier. For some reason, his dive has upset a gang of thugs who rough him him. Clear ...

Stuntman diver Tom Gale wants to make a name for himself by diving to 380 feet and setting the skin diving depth record. Mike tries to talk him out of risking his life wi ...

Mike shares his rubber life raft with three others following a sudden storm that sank their boats. It's soon clear the others have no experience on the sea, making Mike t ...

Mike attempts to rescue a kidnapped Latin American diplomat being held with his wife at sea on his pleasure boat named Santa Rosa. ...

Offshore near Santa Barbara,Nelson is testing a sea scooter. Meanwhile,a know-it-all ex-athlete and his wife are spending the day at the beach with their two kids. The ki ...

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 ...

Diving for sponges off of Florida, Mike hears bells as a fierce current tries to force him into a cave. He barely escapes death, but learns many other divers have met the ...

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 learns of a derelict mine which has drifted into a California harbor. ...

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 comes to the aid of a young diver - in more ways than one. ...

Mike dives to see how a woman escapes from a locked truck at the bottom of a lake. Watching a near-tragedy underwater, he takes his concerns to Harry Baldwin, the head of ...

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

An overly energetic man appears on Nelson's boat and claims to have built a machine which can find shipwrecks by calculating where the shifting of the earth's plates have ...

Nelson,brought to the Latin American port of Santa Pueblo,investigates a recently found German WWII submarine.The sub,which had been on a secret mission,may contain secre ...

Nelson is hired to study shark behavior at various depths and the effects of a new shark repellent.In Caribbean waters and with two other divers assisting him,he is lower ...

Mike pilots a mini-submarine in an attempt to rescue a Russian scientist defector from a ship, where he is being held by his Soviet kidnappers. ...

Mike hunts down a killer whale that has been terrorizing a local coastal community. ...

Mike is hired by the US government to locate the nose cone of an experimental rocket that went down in the Caribbean. It's a hush-hush operation and Mike is joined by ano ...