An experienced mountaineer, Adrian Ballinger knows about the dangers of Everest better than most. He's spent 12 seasons as a guide on the world's highest peak and has summited it eight times -- once without supplementary oxygen, which almost cost him his life.


원문출처 : https://www.cnn.com/2019/06/24/sport/everest-k2-adrian-ballinger-emily-harrington-spt-intl/index.html