There are many reasons that a climber could have to climb Mount Everest – the highest mountain in the world. It can be for personal pride, honor and a sense of achievement, or it could be to set a world record. The second one is concerning as it often involves the climbers getting involved in death defying activities. One of the world record setting tactics that many climbers have tried is climbing Everest without oxygen. And while many have succeeded, quite a few have failed miserably. One of such failures is that of Francys Arsentiev.