I am sure somebody must have thought about it, but is there a risk of running out of anywhere to go during a descent forced by decompression when travelling over high terrain (e.g.Himalayas or European Alps)?
. Oxygen will only last for a limited time, and you have to reach10K ft in order to preserve life of elderly and infirm.
Best route may not be straight ahead, but how do you decide in a hurry? EGPWS, with suitable software might help.
