Mountaineering can be one of the most extreme and unforgiving pursuits on Earth. Even the most experienced climbers can find themselves at the mercy of the mountains. From sudden storms to avalanches and human error, the risks are immense—and when things go wrong, the consequences can be catastrophic. In this video, we’ll take a look at some of the worst mountaineering disasters in history—what happened, who survived, and how these tragedies changed the climbing world forever.