The divers' lives are thrust into further peril when a rare orca attack on a great white shark sends the Neptune Island sharks fleeing to roam the waters of the prime abalone beds.

Everyone in the Port Lincoln abalone industry is on edge, as roaming great white sharks fleeing an orca attack could appear anywhere at any time; one diver elects to dive deep in an effort to avoid the marauding pointers.

Abalone divers are forced to brave more dangerous conditions despite increased numbers of great white sightings along the coast; one team tries their luck close to a sea lion colony in notorious shark-infested waters.