The end of the Everest circus? How Sherpas are taking back their mountain

The most dangerous part of the journey to Everest’s summit is the Khumbu Icefall. The glacier that forms it moves so fast that towers of ice can dislodge and crash down the icefall at any moment. Climbers must scale it before the sun rises, when it is mostly frozen. Everest’s western adventurers will usually only encounter it twice – once on the way up and once on the way down.