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im not sure about the mask. maybe a helmet. you really want no chance of polluting with outside air. Also good if its not to constraining.
I mean when the doctor puts you under he uses a mask for a little until you're out really and takes it off so you dont get brain damage and die, if he just left it on i dont see how it would stop working unless it ran out? Maybe I'm remembering something else
Sure but it gets taped down and such when your under and you are not worried about air getting in as much as so much aneshteia getting out that it will be to low a dosage. With nitrogen you don't want oxygen extending out your awareness or triggers from soemthing like co2. You more worried about it getting in. Then also it just gets to a level of being tussed up which can wierd you out. I mean if you had to but I think the coffin/pod thing is a good compromise of comfort and being able to feel ate ease along with assurance on function.