Captain Mike Flynn and his crew find a young woman paralyzed on the beach when HMAS Hammersley responds to a distress call from Bright Island.
The crew discovers a highly advanced drug-dealing organization. Mike believes that the death of a marine biologist from poisoning is being covered up by the Federal Police.
After locating an abandoned catamaran in the high seas, the crew solves a murder case. When Mike insists on conducting a search and rescue for a missing sailor, Nikki's navigational abilities are put to the test.
Mike must choose between saving the lives of two crewmates who have been stung by the deadly Irukandji jellyfish and rescuing a lost refugee child.
An illegal fishing 'mother ship' is attempted to be captured by the crew, but they are stopped by violent eco-terrorists who want to sink the fishing boat.
When the team nearly runs into a floating shipping container full of North Korean refugees, they discover a people-smuggling network.
A number of shipmates get food poisoning, and the crew members are attracted to a sailor who is fixated on rescue missions.
Despite a violent cyclone, the Hammersley crew sets sail in search of two teenage boys believed lost in a small boat and later discovers an unexploded sea mine washed ashore in the storm. Spider saves a boy's life.
Following the theft of their talisman by the crew of a competing patrol ship, the ship is doomed when a fire starts in the engine room.
A disturbed father who has abducted his own children is being pursued by the team. The group then finds a severely wounded fisherman while looking for the missing family in a swamp filled with crocodiles.
After rescuing sailors from a sinking ship, the Hammersley discovers that the sailors are diamond dealers who will kill to protect their goods.
The crew races against time to save a boat full of tourists from a mass murder plot, which a group of terrorists are planning to carry out and film for the world.
To find a criminal terrorist boat and recover its biotoxin cargo, the crew puts both their lives and the ship in danger.