Overview
Four 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.
Trailer
Crew
DirectorNick Hamm
WriterBen Court, Caroline Ip
Cast
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
Daniel Brocklebank
Martyn Taylor
Jemma Powell
Minnie (as Gemma Powell)
Gemma Craven
Mrs. Dunn
Anastasia Hille
Gillian
Maria Pastel
Policewoman
Celia Montague
Solicitor
Kevin Trainor
Boy in School
Lolita Chakrabarti
Doctor
Claire Fox
Reporter
Jennifer Hockman
Reporter
Jack Tanner
Reporter
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Keywords
jealousyobsessionfalsely accusedclaustrophobiabunkerthirstbulimiasupernaturalmurderpsychologistcelebration
Details
Budget
$4M
Revenue
$8M
TMDb Votes
886
Added May 14, 2026Updated Jun 4, 2026