The Rodenator Pro rodent elimination system is yet another personal invention from my youth that I have seen turned into a commerical product. I didn't have a handy source of 02, but did have access to fair amount of carbide (when mixed with water it produces actylene gas.) It's a bit trickier to get the mix right (too much or too little gas, and no boom) and it was harder to fill the entire tunnel. (yes I am aware of the double entendre, ha, ha.) Check out the videos... I can't wait to own a farm so I can build one of these things.