Race from sea level: British Xenon gas climbers summit Everest in just five days, but now US national claims to have done it in less than four

Mountain Everest above the clouds in Tibet.

The race is on to see who can get from sea level to Everest's summit in the quickest time possible.

Earlier today (May 21), news broke that four former British special forces soldiers became the first climbers to scale Mount Everest using Xenon gas, which helped them go from sea level summit in an extraordinary five days.