After scaling the never-before-climbed 21,000-foot Siula Grande, climbers, Joe Simpson and Simon Yates, face their greatest challenge yet: getting back down. Tragedy strikes when Simpson shatters his leg and they are separated by a series of mishaps.

Discover the world's largest mountain and the highest peak in the world. "Everest, the death zone": In the wake of the 1996 disaster that took eight climbers in a single day, scientists follow a team of hikers to measure, for the first time ever, the toll high-altitude climbing takes on the heart, lungs, blood, and brain. "Everest, the mystery of Mallory and Irvine": The story of the early attempts on Mt. Everest and an exploration of the mystery...