An ugly hostage situation on board HMAS Hammersley sees two of the ship's female officers taken hostage below decks. It’s a day of high tension, which begins when a group of shipwrecked illegal immigrants is rescued from a sand bay. Along with Afghan refugees, and a chronically ill Asian girl, are three super-fit Eastern Europeans who waste no time once they are safe on board.

The crew is exposed to toxic radiation during a daring rescue at an abandoned nuclear test site. Swain's courage is called into question, when he opts out of a high-risk rescue operation and Charge uncovers a military conspiracy over nuclear testing and a long lost B-25 bomber.

Dutchy and Charge take drastic action to catch two prison escapees on a remote island. Hammersley rescues a kidnapped pilot with a dangerous secret. Charge finds himself in a psychological battle with a convicted murderer and Bird gets more than she bargained for when a routine operation turns nasty.

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.

2Dads and Charge come under fire while investigating a UFO sighting. Ryan and Bird befriend a young man with a tortured secret that could get them all killed. Charge hides a health scare that could end his navy career, and Mike suspects a local police chief of masterminding a major drug-smuggling operation.

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.

Dutchy finds himself the prime suspect in a cold-blooded murder after he rescues a beautiful young woman. The Hammersley rushes to save a professional diver trapped in a shark cage.

Mike and Spider are taken hostage during a shoot-out with weapons smugglers. Kate fears her past relationship with Mike will become public knowledge. The Hammersley rescues a former Navy officer lost at sea, with shocking consequences for the crew

Hammersley hunts down a mysterious gang of armed robbers, who are terrorising pearl luggers off the WA coast. Spider and Buffer have a trippy encounter with some hard-partying drug smugglers. 2Dads faces disciplinary action for negligence. Also, Mike is forced to intervene over rumours that Kate and Buffer are romantically involved.

When Hammersley rescues a shipwrecked woman, they uncover a murderous criminal conspiracy. Kate saves Dutch's life during a gun battle with smugglers, sparking his romantic interest, and Bomber makes a shocking decision after she and 2Dads are caught breaking the non-fraternisation rule.

Kate is hunted down by an obsessed criminal after she kills his accomplice during a boarding. When Bird is kidnapped, the crew fears she will be murdered as payback.

The Hammersley is once again in hot pursuit of the cabin cruiser responsible for trafficking weapons and ammunition to the Samaru Islands. Meanwhile Mike Flynn receives a tempting offer from Ray Walsman and Kate's life is placed in danger when she becomes isolated from the crew.

A new crewmate and a stowaway cause mayhem on board HMAS Hammersley. Nikki and Charge are taken hostage by foreign pirates, with explosive results. Nikki is close to breaking point, following the death of her fiance.

The crew of HMAS Hammersley uncovers a terrorist plot to assassinate a senior US official. Kate has doubts about Hammersley's popular new crewmate, a war hero with a dark secret. Mike resists a promotion to Navcom, even though it would allow him and Kate to pursue their relationship.

A kidnap drama on the ocean and relationship tremors below decks rock Hammersley as she sails the Coral Sea.

A series of shocking surprises await the crew when they discover a secret community living on a tropical island. Robert risks his life to save Bomber during a gunfight with drug runners, and Mike investigates claims of an illicit romance between two crew members.

Hammersley hunts down cattle rustlers behind the hijacking of live cattle shipments. Robert takes desperate measures to be seen as a team player by his crewmates, and Bird is terrorised by her ex-boyfriend.

Swain is obsessed with the mysterious sinking of a refugee boat. The crew uncovers a smuggling ring with a deadly method of sneaking goods into Australia, and Bird's romantic life is complicated when Mike's godson Ryan joins the crew of Hammersley.

As part of the boarding party checking a possible FFV, Dutchy doesn't hide his surprise at seeing one of the crew is SAS Captain Jim Roth. His flash of recognition is noticed by the ship's master, and the question now is, has Jim's cover been blown? ASIO "spook" Madelaine Cruise is furious. She confirms that Jim was on a mission and insists CO Mike Flynn shadow the vessel in case Jim needs assistance. And so he does, after Dutchy sees two men fighting on the deck, and the subsequent boarding party finds an area awash with blood and Jim under a tarpaulin with a serious head wound.

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 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.

Buffer gets a lesson in tough love from a sexy training officer. Hammersley is stranded in a deadly mine-field, after being attacked by heavy armed smugglers. Charge goes to extreme lengths to earn the respect of his estranged son and the crew are involved in a sailor's worst nightmare - fire at sea.

A new Commanding Officer and the discovery of a cruel and lucrative trade in crocodile skins results in some tense and disturbing moments for the crew of the HMAS Hammersley.

On patrol in protected waters in the Arafura Sea, a lazy comment from one Hammersley crew member to another that it's "about as routine as its gets" is the ironic curtain raiser to a day of horror. The crew of Hammersley launches a daring raid to recover a cargo of stolen uranium from armed terrorists. Kate queries Dutchy's professionalism after he injures her during a boarding party, and Mike's godson is taken hostage by smugglers.