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An oil rig off the coast of Scotland is the setting for this dark, mysterious drama. Shortly before the crew are due to return to the mainland, they're engulfed in a dense fog. At the same time the rig is hit by a series of tremors and all communication is cut off. And that's just the start, as a serious accident starts the crew wondering if some skullduggery might be afoot. Spoiler alert, the answer's yes. The cast includes Game of Thrones's Iain Glen, Line of Duty's Martin Compston, and Schitt's Creek's Emily Hampshire.