The series is a supernatural sci-fi thriller set on the Kinloch Bravo oil rig in the North Sea. The plot follows a crew whose return to the mainland is halted by a mysterious, dense fog that cuts off all communication and brings with it tremors and supernatural forces. Series Overview & Critical Reception

: It is rated for mature audiences due to violence, gore, and "scary images" involving medical emergencies with significant blood.

: Critics and audiences describe it as an "intelligent sci-fi" that blends mystery, suspense, and a chilling "eerie isolation vibe".