I thought theory was a fire/smoke leaking /explosion inside the tent caused by the homemade stove leading to them cutting their way out and running, and then getting separated and lost in the confusion, before succumbing to hypothermia
It’s been a while since I read about it but IIRC, rescuers arrived just days later and were able to follow their tracks down the mountain to where some of the bodies were eventually found. An avalanche powerful enough to kill the whole party surely would have wiped all this away even if some of it had melted away in the preceding couple of days.
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