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Rated: 6.3 out of 10 with 75 votes.
While hiking in an isolated forest, survivalist Danny Coile and old Army buddy Arron James become hopelessly trapped when they fall into a deep dark cenote with steep walls and no way out. Over the next 85 five days, they transform from mild-mannered old friends into vicious, bloodthirsty animals willing to do whatever it takes to survive.
