While it's possible to summit Everest without oxygen, it's not recommended for most climbers because of the mountain's extreme elevation. Soaring some 5.5 miles above sea level, Everest's air at its peak can't sustain life for more than a few hours. Without extensive training, lack of oxygen can bring on serious frostbite, as well as a condition called hypoxia that affects the brain, causing headaches, hallucinations and eventually death...."
http://www.denverpost.com/2017/05/28/mount-everest-indian-climbers-bodies-recovered/
JESUS SAVES!
