" Climbing along the blade of the summit ridge, sucking gas into my ragged lungs, I enjoyed a strange, unwarranted sense of calm. The world beyond the rubber mask was stupendously vivid but seemed not quite real, as if a movie were being projected in slow motion across the front of my goggles. I felt drugged, disengaged, thoroughly insulated from external stimuli. I had to remind myself over and over that there was 7,000 feet of sky on either side, that everything was at stake here, that I would pay for a single bungled step with my life. Half "

― Jon Krakauer , Into Thin Air: A Personal Account of the Mount Everest Disaster