After a tragic accident, six friends reunite for a caving expedition. Their adventure soon goes horribly wrong when a collapse traps them deep underground and they find themselves pursued by bloodthirsty creatures. As their friendships deteriorate, they find themselves in a desperate struggle to survive the creatures and each other.
Shauna Macdonald
as Sarah Carter
Natalie Mendoza
as Juno Kaplan
Alex Reid
as Beth O'Brien
MyAnna Buring
as Sam Vernet
Saskia Mulder
as Rebecca Vernet
Nora-Jane Noone
as Holly
Leslie Simpson
as Crawler
Oliver Milburn
as Paul Carter
Molly Kayll
as Jessica Carter
Craig Conway
as Crawler - Scar
Tristan Matthiae
as Crawler
Mark Cronfield
as Crawler
