@freemo @W_Lucht @stux It's widely preached that nitrogen is one of the most dangerous chemicals we work with at the plant. Nitrogen-rich atmospheres feel, look, and smell the same as normal air, so one can be asphyxiated without warning. The pain of suffocation comes from CO2 buildup in the body, which doesn't happen when breathing in a nitrogen rich environment. You just lay down and go to sleep. There are (too) many examples of this in the CPI.