CO2 levels and consequences

[vballe]

Naah, CO2 is not how much air still left to brethe, quite the opposite since the O2 transforms to CO2 in our lungs. CO2 is dangerous for humans, that's why you need to ventilate your boat from time to time. I have had up to 80% of CO2 in my games. Don't know if it's realistic, but works here anyway. You should be able to stay under the water for around 30h anyway.