Game of Thrones star Iain Glen and Schitt’s Creek actress Emily Hampshire are the latest names to join creator David Macpherson and director John Strickland on the series.
The announcement comes after Line of Duty’s Martin Compston and Guilt actor Mark Bonnar were unveiled to star in the show.
The six-part thriller follows a group of workers who are due to return to the mainland from the North Sea when an eerie fog descends and a mysterious force begins to take hold.
Glen will play the leader of the crew, while Hampshire takes on the role of a scientist and oil company rep and Compston depicts a communications officer.
Small Axe’s Rochenda Sandall, Game Of Thrones actor Owen Teale and Bridgerton star Richard Pepple will also feature in the series.
Calvin Demba, Emun Elliott, Abraham Popoola, Stuart McQuarrie and Molly Vevers will also appear.