The crew of Hammersley is rocked by the mysterious death of a much-loved shipmate. When valuable "Red Gold" coral is stolen from a dive boat, HMAS Hammersley is drawn into a web of murder, piracy and eco-terrorism. Then, Swain and Spider are kidnapped by an obsessed vigilante, determined to rid Australian waters of illegal fishing boats.

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.

In episode three of Sea Patrol, the plight of a critically ill, pregnant woman presents a challenge to the medical skills and emotional stamina of several of the Hammersley crew. Yanlin (Hsiao Ling Tang) is one of a group of Asian women found when the patrol boat team boards a suspect fishing vessel.

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

Nikki starts investigating the mystery behind ET's death. But can she handle the truth? Swain risks his life to save a boy suffering from the bends. Spider tries to free a child slave from an illegal fishing boat, but lands himself in hot water. Tempers fray when Hammersley rescues an old enemy following a bizarre diving accident.

Hammersley is tasked with protecting a shipment of nuclear waste from a terrorist attack. When a bomb is discovered on board, Robert and 2 Dads must set aside their differences to save Hammersley. Buffer falls victim to a practical joke and Robert is tricked into going on a drunken date, with disastrous results.

Kate is terrorised by a mysterious stalker on board an abandoned cargo ship. Spider contracts deadly coral poisoning during a bizarre snorkelling accident and Buffer and 2Dads face a freezing fate in a tropical paradise.

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.

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.

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 thrilling rescue becomes a tragic mystery when a healthy young tourist dies suddenly on board Hammersley. Bomber and RO fight for their lives when an armed gang tries to seize control of Hammersley. Nicki receives a death threat while investigating ET's diving accident.

A rescue at sea casts doubt on the circumstances of ET's death. While searching for a missing kayaker, Buffer stumbles across an illegal oil smuggling operation. Charge's weight threatens to sink his navy career. Will he become the biggest loser?

In an explosive series climax, Mike and his crew takes extreme action to thwart an oil smuggling conspiracy and avenge ET's murder. Nikki risks everything to uncover the truth about ET's final moments. Kate is trapped in a deadly showdown with one of ET's killers.

A suicide bomb attack in a nightclub has a shocking impact on the crew of HMAS Hammersley. Dutchy goes undercover with the SAS to capture a group of deadly extremists before they can attack Australian targets. 2Dads risks his life to save Hammersley from a bomb attack. Kate's world is rocked when her former lover, SAS officer Jim Roth, returns to Hammersley. Mike risks his career by refusing to co-operate with a high ranking ASIO spy.

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.

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.

Kate uncovers a deadly conspiracy when she investigates a cluster of rare illnesses on a remote island. Hammersley is on the hunt for a ship suspected of dumping toxic chemicals into tropical waters.

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.

Robert becomes the lifeline when 2Dads is trapped alone in a sunken research submarine. Mike and the crew pursue a marine biologist suspected of sabotaging the submarine, and with 2Dad's air supply running out, Charge must use all his technical skills to help save his mate's life.

The crew of Hammersley are caught in a deadly fire fight while rescuing an SAS team from an undercover mission.

Dutchy and the crew are caught in a deadly fight for survival when a training exercise turns into a manhunt.

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.

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.

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.

Bird is compromised when she discovers Ryan working for a private security firm while AWOL from the navy. Mike fears his son has been murdered by mercenaries and risks his career to get revenge on the killers. A pregnancy scare forces Kate to reconsider her future.