He froze his butt off. Literally once ( He says it is not recommended)
among other thing he did...
"Canyons and Ice". Pioneer in "Pack Rafting", now a global thing, in the very first Hope to Homer 150 mile "Wilderness Race". (It ain't race- it's a survival thing... ya gotta get there, somehow, anyhow... )
Old(er) age and treachery vs 25- 30 year olds, including Roman Dial...