When HMAS Hammersley answers a distress call from Bright Island, Captain Mike Flynn and his crew discover a young woman lying paralysed on the beach. She is conscious but unable to talk, and despite their best efforts they are unable to save her. Thus begins new Executive Officer Lieutenant Kate McGregor's first day aboard a patrol boat, and CO Mike Flynn's obsession with the mystery of Bright Island. Something very odd is happening in connection with the Island. The Federal Police move in to investigate the woman's death, but no-one is talking. Her colleague, the striking Doctor Ursula Morrell, seems to know more than she's letting on, and Mike finds himself drawn to her cool beauty and her vulnerability.

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. Kate is jealous of Mike's relationship with Ursula Morrell, while Nikki struggles to restrain her feelings for ET.

Mike is torn between saving the life of a missing refugee girl, and the lives of two shipmates bitten by the deadly irukandji jellyfish. While pursuing pirates, the Hammersley rescues a family of illegal immigrants from an unseaworthy ship.

The Hammersley attempts the daring capture of an illegal fishing ‘mother ship’ but is thwarted by violent eco-terrorists. Mike finds himself falling in love with beautiful marine biologist Ursula Morrell, who later goes missing under mysterious circumstances.

The crew uncovers a people smuggling racket, when they almost collide with a floating shipping container full of North Korean refugees. The Hammersley races to capture the smugglers’ ship and save the lives of their human cargo. Kate is wooed by a charming civilian sailor. Meanwhile, Mike is determined to solve the mystery of Ursula’s disappearance.

The HMAS Hammersley confronts a series of new menaces in the northern waters from pirates to toxic crabs, not to mention a gorgeous solo yachtswomen with a rescue fetish.

The video of Chefo's bucks night finds its way into Kate's hands and she is humiliated by what she finds on it. The HMAS Hammersley comes across an unexploded sea mine and Spider manages to save the life of a boy who was near the mine, but have Spider's days in the navy come to an end?

Disaster looms for the Hammersley crew when a fire erupts in the engine room, after the mascot is stolen by a rival Patrol Boat crew. Meanwhile, an eye injury threatens to destroy Charge's career, and ET takes a vow of chastity in a desperate attempt to prove himself to Nikki.

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.

The Hammersley saves sailors from a sinking ship, only to learn they are diamond smugglers who will kill to save their cargo. Swain is kidnapped by smugglers and left trapped in their sinking ship. Will Buffer rescue him before the ship sinks? Mike is reprimanded by Navy brass over his obsession with the Bright Island mystery.

The Hammersley races to save a boatload of tourists from being murdered as part of a bizarre terrorist publicity stunt. Meanwhile, Swain and the crew help deliver the baby of a runaway teenager, found lost at sea with her criminal boyfriend. A series of emergencies at sea prevent Swain from attending the birth of his first baby.

As the decommissioning of the HMAS Hammersley draws near, the crew risks life and ship to hunt down a rogue terrorist boat and retrieve its cargo of bio-toxins. In ordering the sinking of the rogue ship, Mike makes the most difficult decision of his career.