A renowned mountain guide puts clients on Everest summit less than a week after they left London

Four British climbers pose on the summit of Mount Everest less than a week after leaving London, in one of the fastest ascents on record of the world's highest peak, in Nepal, Wednesday, May 21, 2025. (Sandro Gromen via AP)

KATHMANDU, Nepal — An expert mountain guide successfully put four of his clients on top of Mount Everest on Wednesday less than a week after they left London, one of the fastest ascents on record of the world’s highest peak.

The four British climbers flew from London to Kathmandu on May 16 and reached the 8,849-metre (29,032-foot) summit Wednesday morning local time, according to Lukas Furtenbach, who has been using different methods over the past five years to speed up the climb.

The climbers had put in months of preparation, training in hypoxia tents and undergoing xenon gas treatment at a clinic in Germany before heading to Nepal.

“Xenon improves the acclimatization and protects the body from altitude sickness and the effects from the hypoxic environment. Xenon makes the climb safer,” Furtenbach told The Associated Press from the base camp at Everest.

He said all the climbers were safe and returning back to lower camps after the successful ascent on Wednesday

Climbers normally spend weeks at base camp to acclimatize to the higher altitude. They make practice runs to the lower camps on Everest before beginning their final attempt on the peak, so that their bodies are prepared for the low pressure and lower level of oxygen available.

The new method is likely to reduce the time climbers spend out of their home countries and cut the number of days they need to take off work, also cutting down on expenses.

Nepal does not have any rules on how many days climbers must spend acclimatizing or making practice climbs. Their permits, which cost US$11,000 each, are valid for 90 days. Climbing season normally wraps up by the end of May, when the weather deteriorates and monsoon season begins. The ropes and ladders fixed to the mountain are then pulled out.

Hundreds of foreign climbers have been given permission to climb Everest this year. Roughly half of them have succeeded and the remaining will likely attempt their climb within the next few days.

Binaj Gurubacharya, The Associated Press