Most HBO chambers are non confining, take a book, sit up, and they are clear and you can see out. The only chamber that I was ever in that was confining, was a decompression chamber after a deep dive incident on normal air SCUBA while instructing.

Brian, stage 4 oral cancer survivor. OCF Founder and Director. The first responsibility of a leader is to define reality. The last is to say thank you. In between, the leader is a servant.