In May 2014, All fell 72 feet into an open crack on a different mountain, breaking ribs and his right arm.
But when a wall of the mountain broke off, destroying the road, the elder Mr. Sis was separated from the project, and lost in Tibet.
Experts say that it was just after 8 p.m. that day in September when a mass of hanging ice on 15,700-foot Dzhimara Mountain broke loose and caromed off two glaciers, sending chunks of all three rolling down the mountain.
It was a brief, brutal, seated acceleration, with Froome's fragile body bent almost double with the effort of revving the pedals with a violence that is barely ever seen in cycling on a mountain, broken only for a fraction of a second when he paused to change into a higher gear.
Millions of years ago, the limestone top of the mountain broke and the inside of it was drained out by the river.
The lower slope began to slide slowly, but just 50 seconds after that began, an upper part of the mountain broke loose and collapsed onto it.
As the video ends, Usher kneels, and the mountains breaks around him, leaving a sole pillar for him to stand on.
It is not good terrain for guerrilla fighters in contrast to Afghanistan with its high mountains, broken hills and isolated villages.
This stark country with its mountains breaking out of the bog always appeals and the silence after yesterday's din was a living grace.
The Pyrenees are exceptionally steep mountains broken by wide passes that have provided transit for hunters, herders, smugglers and religious as well as political fugitives — and, of course, armies.
