Furthermore, breathing “gas” only increases the relative oxygen to about the same level as the air at basecamp, and if it runs out on summit day, the body might not be able adapt to the sudden lack of oxygen.
Furthermore, breathing “gas” only increases the relative oxygen to about the same level as the air at basecamp, and if it runs out on summit day, the body might not be able adapt to the sudden lack of oxygen. Lastly, oxygen units are notoriously unreliable, as Everest guide Adrian Ballinger discovered in 2018 on summit day when his team experienced a systematic failure of their breathing systems.