A British expedition summited Everest in days while supplementing xenon. Is it the secret ingredient mountaineering has been ...

Four climbers went up and down Everest in under a week with the help of xenon gas—a record-breaking ascent that has ignited controversy in the mountaineering world.

History is repeating itself in the world of controversial sports records.

But the use of xenon gas, promising to make the mountain even more accessible, has led to heated debate. Once the pinnacle of human endurance, Everest is already increasingly crowded and commercial.

Before beginning the climb, each mountaineer will be given a xenon blend formula created by German doctor, Michael Fries. After a 30 minute administration of the noble gas, the group will then ...

The use of xenon gas treatment has, however, drawn controversy and has even raised the concerns of Nepalese mountaineering authorities who have announced an investigation.

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Fries administered the xenon gas about a week and a half before departure. Whether the team’s success is attributable to xenon “is difficult to say,” Fries says.

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