In Korea, they use a traditional heating system, the Ondol. Basically, this is like a fireplace under the floor. The firebox at one end of the house, and the chimney at the other. The smoke and hot gasses flow through a maze of smoke passages, heating the masonry floor.
In the 2nd Infantry Division, we would hold classes on the Ondol every fall. Soldiers take a pass, and spend the night with their girlfriends. If there is a leak in the Ondol, it leaks Carbon Monoxide. And every year there will be a couple of deaths from Carbon Monoxide poisoning. From seeing the bodies, I can tell you Carbon Monoxide poisoning is completely painless -- no sign of struggling, grimacing, or anything like that. The victims just fall into a deeper sleep.
So why not use Carbon Monoxide for executions?
In the 2nd Infantry Division, we would hold classes on the Ondol every fall. Soldiers take a pass, and spend the night with their girlfriends. If there is a leak in the Ondol, it leaks Carbon Monoxide. And every year there will be a couple of deaths from Carbon Monoxide poisoning. From seeing the bodies, I can tell you Carbon Monoxide poisoning is completely painless -- no sign of struggling, grimacing, or anything like that. The victims just fall into a deeper sleep.
So why not use Carbon Monoxide for executions?

Comment