As the climbers descend from the summit, it becomes a race against time to get back to camp before dark. But a severe blizzard slows their progress to a crawl, and altitude sickness starts to take hold. Some climbers get stuck in the upper reaches of the mountain, while others get lost not far from camp. As darkness falls, the stranded face the terrifying reality of spending the night outside, where oxygen deprivation and hypothermia could easily take their lives.

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