The climbers drank water brewed from snow by melting it using a gas cooker. They needed about four to five liters of water per day each. At altitude, the air is thin and your body has less oxygen so it dehydrates itself.
A film club episode about the award-winning documentary film "Touching the Void" about a mountain climbing expedition which goes wrong. It's an amazing true story and there are lots of things to learn from it, including lessons about motivation and attitude towards any challenge. The film is available on Netflix and DVD. Check it out and use this episode to help you understand it all.
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