Distraught, confused, and half-wild with fear, Sarah Carter emerges alone from the Appalachian cave system where she encountered unspeakable terrors. Unable to plausibly explain to the authorities what happened - or why she's covered in her friends' blood - Sarah is forced back to the subterranean depths to help locate her five missing companions.
Shauna Macdonald
as Sarah Carter
Natalie Mendoza
as Juno Kaplan
Gavan O'Herlihy
as Vaines
Josh Dallas
as Greg
Anna Skellern
as Cath
Saskia Mulder
as Rebecca Vernet
Douglas Hodge
as Dan
Krysten Cummings
as Ellen Rios
Michael J. Reynolds
as Ed Oswald
Jessika Williams
as Susanne Small
Doug Ballard
as Doctor Roger Payne
Josh Cole
as Lynch
