Baz and Garrow get closer to understanding their mission when they explore the pump control room, and realise they need Fulmer to help them - leading to painful consequences for Fulmer as he struggles to keep a grip on his sanity. When the crew's anxieties rise as a glimmer of potential hope turns sour, Magnus finds himself losing his grip as tensions amongst the group reach fever pitch.
The crew of the Kinloch Bravo oil rig are stationed off the Scottish coast in the dangerous waters of the North Sea. When they are due to be collected and return to the mainland, a mysterious and all-enveloping fog rolls through. The rig is hit by massive tremors, and they find themselves cut off from all communication with the shore and the outside world.
As the crew endeavour to discover what's driving this unknown force, a major accident forces them to ask questions about who they can really trust. Bonds are broken, allegiances formed and generational fault lines are exposed. The crew of the Bravo will be driven to the limits of both their loyalties and their endurance, leading to a confrontation with forces beyond their imagination.
The Rig - Season 1, Episode 4 Synopsis and Schedule