The pilot is still alive inside the sunken wreckage of a jet plane.

Mike travels 1500 miles inland to a flooded mine where two men are trapped in a foul air pocket. However, there is only enough air in his tank to rescue one of them at a time, and not enough air in the pocket for the remaining man to survive.

Skin divers fall victim to the rapture of the deep, and one becomes homicidal.

A body washes ashore bearing marks apparently made by a giant octopus.

When Mike rescues a girl from drowning, the Immigration Department suspect she is an illegal alien.

Although Kay Dalton is scared of the sea, she is determined to dive for a cache of stolen diamonds.