One thing I have never had is claustrophobia. I have been in dozens of caves and the only time I ever got concerned was in a cave called Little Muddy in Nevada. I got caught in a crawl space only an inch or so larger than I was and began to panic. Actually, a flashlight I was wearing had gotten jammed between my chest and the rock. After a few minutes, I finally talked myself back to calm and collected and began the very slow process of extracting myself from the crack, one inch or less at a time. When I get an MRI, they always ask me if I dislike small spaces. I always say no, I just go to sleep.