Series 3 reveals what the daily life is like on board HMS Northumberland, one of the most advanced warships in the Royal Navy. With unprecedented access to the Type 23 Frigate and its crew of over 200 people, we reveal what it means to live and work at sea for months at a time – as far North as the Arctic Circle – and follow the crew as they battle a threat from Russian warship sand nuclear submarines surrounding the UK in an attempt to overwhelm the Royal Navy.