Terror mounts as fear cuts deeper in the chilling continuation to the globally successful horror hit "The Descent". Traumatized, Sarah Carter emerges alone from the cave system where she confronted her darkest dread. With no rational explanation to what happened, the authorities force her back into the subterranean depths to help locate her five missing girlfriends. But as the rescue party enters further uncharted domains, flashbacks start haunting Sarah as shocking memories of the past hit home. For they are venturing into the habitat of a new tribe of Crawlers, even more viciously feral than Sarah faced before.