Four British men have successfully completed a controversial high-speed expedition on Mount Everest, reaching the summit in just five days with help from xenon gas. The climbers—who are all former special forces soldiers—left the United Kingdom on May 16.

A new proposal from Nepal aims to tighten requirements and improve climber safety on the world's tallest peak, but such proposals rarely become law.

A group of British men went from London to the summit of Everest and back in less than a week with the help of xenon gas. Mountaineers and the Nepalese government weren’t pleased.