Quote Originally Posted by secretagentmole View Post
Nitrogen is inert and makes up about 78% of the air we breathe, nothing wrong in using it at all.....
I couldn't disagree more strongly. The use of nitrogen in PCPs, regardless of its particular properties, would represent a departure from the safe, easy-to-understand rule of 'diver's quality air only', and that is a potentially disasterous departure. When we step away from the safest system through experimentation with gasses other than air, the potential for life-changing injury or death outweighs any percieved gains. I say this after personally witnessing the aftermath of PCPs filled with oxygen and oxy-acetylene, and the injuries this caused. Make no mistake, if we ever sanction the use of gasses other than air, sooner or later someone will be seriously injured or killed.