After reports of a nuclear explosion in the outskirts of the city and on the urging of an elderly man, the two families either side of his house retreat to the his bunker deep underground.
Two months locked inside, cabin fever starts to set in. The door that had been sealed, jammed shut to keep them safe, becomes a symbol of their imprisonment.
Desperate to escape their confinement, one woman tries to break out by freeing the door. The old man is enraged and threatens them should they try to leave.... he will have no choice but to shoot them. Believing it to be idol threats, the woman goes ahead and continues her efforts. To their horror, the old man shoots her dead.
Trapped with a killer deep underground, what do you do next? What lines do you cross and how will you escape?.....That is.... If Earth exists as they knew it. Time is running out.