Gilldiver
Contributor
Many of the plexiglass single place chambers have no mask and you are in a 100% O2 atmosphere and at 3 ATM/60'. The biggest risk is O2 fires so they are very picky about what you you have on in them or bring in with you.
But, As other have said, a quick visit to 1.7 to 2.0+ ATM will not kill you, say if you had a full gas failure and no option but deco gas to get up to deco depths. A number of years ago it was common practice to teach new commercial divers about Ox Tox by taking them to 60' in a chamber, putting them on 100% and make them do push ups till they toxed. It was to show the student that OxTox could sneak up on you without warning and what it looked like.
But, As other have said, a quick visit to 1.7 to 2.0+ ATM will not kill you, say if you had a full gas failure and no option but deco gas to get up to deco depths. A number of years ago it was common practice to teach new commercial divers about Ox Tox by taking them to 60' in a chamber, putting them on 100% and make them do push ups till they toxed. It was to show the student that OxTox could sneak up on you without warning and what it looked like.