The Hammersley uncovers a sophisticated drug smuggling network, with explosive results. Mike is convinced the Federal Police are covering up the poisoning death of a marine biologist.
The crew uncovers a murder mystery after finding an abandoned catamaran on the high seas. Nikki's navigation skills are tested when Mike insists on doing a search and rescue for a missing sailor.
The HMAS Hammersley attempts the daring capture of an illegal fishing 'mother ship', but they are thwarted by violent eco-terrorists intent on sinking the fishing boat.
The men of the Hammersley are smitten by a female sailor with a rescue fetish. Meanwhile, several crew members succumb to food poisoning - or is it something more sinister?
The crew pursues a distraught father who has kidnapped his own children. Then, while searching a crocodile-infested swamp for the missing family, the crew discovers a badly mauled fisherman.