Had my run in with a tree well in Snowbird years ago....I needed to take a piss and pulled off a trail to get a little cover. It was an epic day, dumping like crazy, in Utah for the first time...just having a blast. I knelt down next to a tree and bam!...went right through head first. Buddy I was riding with could not see me. Instinctively, I reached out and was able to get my hands on the trunk and extended my body so I did't keep dropping. It was way deeper than I would have thought. Luckily, I was able to get upright enough using the trunk and call for help. Between the altitude and struggling my ass off to get out, I was smoked. Had this been a bigger tree, I don't know how this would have turned out, probably another statistic because the guy I was with would not have waited long in those conditions.