The idea of being underground creeps me out more than just about anything; even more than Post Malone music. Over Thanksgiving the Baker Family visited my wife's Uncle in Colorado Springs. The Baron wanted to go to Pikes peak but we got there after 3:00 and they wouldn't allow us to go to the top so; back down we went. Driving down the mountain suddenly he sees a sign; "Wind Cave Tours" or something like that. I don't remember if they are called "Wind Caves" or "Windy" or whatever because the word I was focusing on was "CAVE." The idea of being underground terrifies me but... The Baron and Dartanian really wanted to explore so it was "butch up Sally" time.
As we were working our way through these narrow passages my "fight or flight" reflexes were at level 10! In fact there was no "fight" there was only "flight."
Just breathe. That's what my dive instructor said; "don't panic, just control your breathing."
Crawling through tiny holes, underground, with tons of rock over my head... yea right, I'm controlling my breathing and other body functions.