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.

Top Cast

Thora BirchLiz Dunn

Desmond HarringtonMike Steel

Keira KnightleyFrances 'Frankie' Almond Smith

Laurence FoxGeoff Bingham

Embeth DavidtzDr. Philippa Horwood

Steven WaddingtonDCS Tom Howard

Emma Griffiths MalinDaisy

Kelly HunterDI Chapman