Mike takes command of the first underwater flotilla of the United States Coast Guard Auxillary in search of sunken radioactive cargo. ...

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

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

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

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

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 ...

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