Loading detailsβ¦
Loading detailsβ¦
directed by Nick Hamm
Once you get in, you can't get out.
Streaming availability varies by region.
Search all platforms βFour teenagers at a British private school secretly uncover and explore the depths of a sealed underground hole created decades ago as a possible bomb shelter.

Thora Birch
Liz Dunn

Desmond Harrington
Mike Steel

Keira Knightley
Frances 'Frankie' Almond Smith

Laurence Fox
Geoff Bingham

Embeth Davidtz
Dr. Philippa Horwood

Steven Waddington
DCS Tom Howard

Emma Griffiths Malin
Daisy

Kelly Hunter
DI Chapman
Director
Nick Hamm
Language
EN
Budget
$4M
Box Office
$8M