All they have to do is breathe their oxygen tank as the Sherpas drag their living corpses up the mountain (and back down, if they’re lucky).
If it’s that simple maybe you should give it a try.
re the Sherpas:...it really does seem that the Sherpas are the ones doing the work....you never see their names but they make all these climbs repeatedly, and they carry all the stuff too...
I thought everyone carried one of those bags you could pressurize a sufferer in these days?