Mike attempts to recover a Top Secret diplomatic pouch lost in hostile foreign waters. ...

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

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

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

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 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 ...