Seven volunteers all signed up for the same temporal isolation program. Whilst not particularly interested in the research purposes of the experiment, for a £7000 payment they could live with being sealed inside an underground bunker for a period of three and a half weeks. While they were under something went terribly wrong. When the experiment ended, nobody came to let them out. When they break out of their temporary home they find the surrounding facility deserted. The world that greets them is silent and desolate; all the communications are dead, there's no power and smoke rises on the horizon. The huge sprawling concrete facility is devoid of human life. What could have caused such a catastrophe? Is there something else out there? Even if they escape with their lives, what awaits them beyond the grounds of the facility?