Everest Without Oxygen

With over 5,000 climbers having reached the top of Everest, it no longer seems an insurmountable challenge. But just over 200 climbers have made the ascent without the assistance of oxygen - with many climbers dying in the process. Rasmus dreams of becoming the first Danish person to make this risky climb - but just what drives individuals like Rasmus to put their life at risk to complete a challenge?