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.

A small crew out of the UK summited Everest in days with the help of xenon gas. Here's what xenon gas is, why it's used for climbing, and the risks of using it.

Mount Everest’s Xenon-Gas Controversy Will Last Forever History is repeating itself in the world of controversial sports records.

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.

A group of British climbers have sparked a fierce debate after they reached the summit of Mount Everest in less than a week, crediting xenon gas as their secret weapon to acclimatize much quicker ...

Four British climbers made it from London to the peak in under five days after preparations that included inhaling xenon gas.

Did Inhaling Xenon Gas Really Help Mount Everest Climbers Reach the Summit in Record Time? British climbers recently reached the top of Mount Everest in record time.

Climbers using xenon gas reached the summit of Everest in under five days but critics say the shortcut could lead to dangerous overcrowding and undermine the spirit of mountaineering.

The use of xenon gas by a group of British mountaineers before they began an expedition to climb the world's highest mountain in less than five days has raised questions about its effectiveness ...

British climbers recently reached the top of Mount Everest in record time. They inhaled xenon gas before the trip. But was that the decisive factor?

Four British climbers ascended Mount Everest in under a week, aided by a controversial new treatment called xenon gas. NBC News' Camila Bernal explains the controversy as some critics say it is ...