The Frightening, Unsolved and Disturbing Incident of Nine Dead Skiers

I'm very curious as to why they were in a state of undress prior to tearing open the tent? Logic would dictate that at that temp they wouldn't strip to their underwear to go to sleep, and would instead be fairly well-clothed; at least long johns or something similar.

Also, does anyone know in what chronological order they died? I mean, who died first, then next, etc.?