IvoryT abd daDoc.
Thank you for the education. My understanding, which could be entirely wrong as it is poorly remembered from my days working in submarines and ships in the 80's and the enclosed space work I had to do often in CO2 rich environments, was that yes CO2 will at some point render you unconscious but death almost always occurs from asphyxiation because the person usually falls down into the denser CO2 layer so that exacerbates the lack of oxygen but that also at a certain level of CO2 in the lungs it prevents them from being able to absorb O2 which leads to death, again by asphyxiation, technically.
Happy to be told I am wrong.
Biting the hand that feeds IT
