AllMovie

When communications to a top-secret underground research facility inexplicably cut off, eight desperate workers must battle their way up through 13 floors, fighting flesh-eating mutants every step of the way, in order to reach the surface and escape a fate worse than death. The year is 2017. One mile underground, in research station 320, all hell is about to break loose. With no means of calling for help and hordes of rampaging mutants blocking every exit, two research technicians, a pair of research subjects, a medic, and three mercenaries find their supplies starting to dwindle, and their time running out. Now one of them is in the beginning stages of a horrifying transformation, and unless they reach the surface soon, everyone will die.