After discovering a sunken Japanese submarine, the amateur skin diver who found it goes violently berserk.

While looking into the possibility of linking two Latin American lakes by a canal, Mike runs afoul of rebel guerillas.

A Greek sponge diver and his pretty girlfriend lay a minefield for Mike, fearful that he will interfere with their discovery of a valuable statue on the Mediterranean seabed.

Mike and a pair of archaeologists risk the anger and booby traps of islanders while exploring underwater caves in the Caribbean.

Mike defies tales of a mysterious sea serpent when he searches for a shipment of stolen liquid explosives in Arabia.