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.
Production companies：
Pathé
·
UK Film Council
·
StudioCanal
·
Cowboy Films
·
Granada Productions
·
Impact Pictures
·
Budget：$4,158,370.00
Revenue：$7,819,851.00
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.
