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Waking up from a car accident, a young woman finds herself in the basement of a man who says he's saved her life from a chemical attack that has left the outside uninhabitable.
the official version from paramount.com on March 9, 2016
About woman who wakes up underground after a terrible car accident and fears she’s been abducted. Her captor, a doomsday prepper, warns her that a terrible chemical attack has left the outside world uninhabitable but as tensions rise she decides she must escape regardless of the terrors that await outside.
verbatim from deadline.com on August 25, 2014