Astonishing footage has emerged from the roof of the world, as hundreds of climbers queued to scale Mount Everest in a single day.

Huge queues have been seen amassing across a dangerous patch of Mount Everest as hundreds attempt to climb the world's tallest peak.

A British climber improved his own Everest record on Friday and notched his 20th ascent of ​the world’s highest mountain, hiking officials said.

Writer Jon Krakauer was there as a client of Kiwi Rob Hall’s Adventure Consultants on assignment for Outside, and the magazine story he turned in became the book Into Thin Air, which immediately surged to #1 on the New York Times bestseller list.