As the survivors try to sleep just enough to stave off fatigue without dying, they slowly go mad and eventually reach the point where they can. As they try to find a way back, all they are doing is sinking deeper into a nightmare scenario. When they sleep, they attract a terrifying force that sucks the life out of their bodies, but the longer they battle exhaustion and stay awake, the less likely they are to survive. A helicopter crash left a group of explorers stranded near an Arctic base.
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