Episode list

The frigate HMS Northumberland prepares to leave port for a 4-month deployment with a crew of 220. Huge amounts of food are loaded onboard along with the ship's new chef, but a fire nearly undoes the entire mission before it's begun.

Travelling off the coast of Scotland, HMS Northumberland receives intelligence about a Russian submarine that's currently under surveillance.

The crew of HMS Northumberland are hunting for a Russian submarine in the Arctic Circle - which has disappeared from the ship's radar.

Navy Command sends news about a gathering of Russian warships and submarines off the coast of Ireland and Northumberland is ordered to investigate.

HMS Northumberland is deployed off the west coast of Ireland and receives intelligence that a Russian warship has been spotted heading towards Faslane.