Behind deep mountaineering experience and good health, the next most powerful driver of success on very high summits is the use of supplemental oxygen. Since 2012, oxygen masks have been refined and reengineered to deliver flow rates as high as 6 liters per minute—a 300 percent increase over the traditional 2 liters per minute. This technology has fundamentally changed what is possible on 8,000-meter peaks, enabling compressed acclimatization schedules and faster ascents. Understanding how supplemental oxygen works, and its limitations, is essential for any climber planning an expedition above 7,000 meters. How Does Supplemental Oxygen Work at Extreme Altitude? Oxygen…