This is easily the most dangerous method possible for everyone involved. Strangely enough our body only reacts to buildups of CO2, it does not react to a lack of oxygen.
So while in theory it would be painless as an execution method, if anything leaks into the viewing area for the execution there is no visible signs anyone is in danger as oxygen is being displaced thus potentially killing everyone involved.
This is easily the most dangerous method possible for everyone involved. Strangely enough our body only reacts to buildups of CO2, it does not react to a lack of oxygen.
So while in theory it would be painless as an execution method, if anything leaks into the viewing area for the execution there is no visible signs anyone is in danger as oxygen is being displaced thus potentially killing everyone involved.
It’s well established how to administer this method of death, I don’t see this same safety concern as you do.