While hiking in an isolated forest, survivalist Danny Coile (Les Stroud) and old Army buddy Arron James (Stacy Brown Jr.) 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.

A backwoods team of Missouri kids race to solve a 100 year old mystery and save their friends in this family friendly action adventure. Chased deep into ancient caves they must escape treasure hunters hot on their trail or be lost forever.