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：
Dimension Films
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Cowboy Films
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Film Council
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Granada Productions
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Impact Pictures
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Pathé Pictures International
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Canal+
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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.
