CO2 poisoning is insidious, and can go unrecognised, due to its cognitive effects. It's a known risk in using rebreathers when scuba diving. The UK HSE has pub

CO2 poisoning is insidious, and can go unrecognised, due to its cognitive effects. It's a known risk in using rebreathers when scuba diving. The UK HSE has published a video of a real-life incident where someone experiences CO2 toxicity from a rebreather (the victim survived and recovered) [1]. [1] http://www.hse.gov.uk/diving/video/co2video.htm http://www.hse.gov.uk/diving/video/co2video.htm