Quote Originally Posted by Pwilliams58 View Post
As I said before, depth is more critical than air-tightness. I think you'll find that container is going to be a huge problem, especially when it blows up, possibly injuring you, and sending little rodents flying everywhere. There has to be a place for the air that was already inside the container to go, so maybe drill an equally sized hole on the top somewhat close to the other hole. Because if not, it'll just build air pressure in there and it'll just keep compressing until the container can't take anymore.
if you do this make sure you setup a video camera first because i would have to see rodents just flying through the air!

p.s. make sure you put that hole in the top. CO2 is heavier than air hence if the hole was in the bottom it would technically just leak out and never accumulate in the tub evacutaing the oxygen