Director Kevin Macdonald's acclaimed, hugely powerful documentary recreating the terrifying struggle for survival faced by mountaineers Joe Simpson and Simon Yates, who braved the Peruvian Andes. During the descent, one of the men fell, breaking his leg and forcing his friend to leave him - but remarkably he beat all the odds to survive. The story is told in the climbers' own words and features dramatised reconstructions of their ordeal.

The true story of Joe Simpson and Simon Yates' disastrous and nearly-fatal mountain climb of 6,344m Siula Grande in the Cordillera Huayhuash in the Peruvian Andes in 1985.