The amount of carbon dioxide (CO2) that can be safely inhaled by rebreather divers is a continuing point of conjecture, and vigorous argument. Unfortunately, the U.S. Navy  Experimental Diving Unit has confused that issue, until recently. A non-diver might wonder why a diver should inhale any CO2. After all, the air we breathe contains only a small fraction … Continue reading How Much is Too Much? (Carbon Dioxide – The Diver’s Nemesis)