I had to do a session in an altitude chamber as part of training in my early military career. I remember how scary it was feeling like I had just sat down on th

I had to do a session in an altitude chamber as part of training in my early military career. I remember how scary it was feeling like I had just sat down on the bench and been there for no more than 3-4 minutes tops when I was told time was up, but then watching the film of my session and realizing I had been in for 30 minutes and couldn’t perform the simplest tasks the trainers were instructing me to do.