Graham Zimmerman and Ian Welsted were climbing up the West Ridge of Chogori—the Balti name for K2, meaning “big mountain”—climbing alpine style, carrying all they needed in their packs.
Seeking cooler temperatures, they climbed at night, with the full moon light throwing shadows on the rock towers and illuminating snow on the peak.
“I felt bewitched by its beauty,” Zimmerman wrote in his book, A Fine Line: Searching for Balance Among Mountains.
Two days later, resting under the heat of the daytime sun, he and Welsted listened as a volley of rocks rocketed down a nearby couloir, the exact couloir they intended to climb up. Prior to leaving for the Karakoram, conversations with others who had climbed in the region led to the prevailing wisdom that above 6,400 metres (21,000…