Yes you would either melt or drill holes. I prefer to use water with dry ice as it speeds up the process considerably. I think I have a post somewhere here about building your own Co2 chamber ... Pretty much identical to what Elevate put in this thread.



Heres the tupperware type that I use. More details can be seen at http://www.rodentracks.com/DIY_Co2_Chamber.html

I do it in the house at times and in the shop. The only real danger is putting your head into the bucket/cooler while the dry ice is actively sublimating (other than burns)

As far as amount of ice if I have everything ready to go I can do 50 rat pups, 50 adult mice, 10 medium rats, 4 large rats, and 2 jumbo rats on a 1/2 lb of dry ice (in water).

Without the water you will need to keep them in an extra amount of time ... One of my friends called me up cause his rabbits were screaming after he Co2'd em. He hadnt put in enough water, causing the dry ice not to sublimate fast enough, and had pulled them out after 4 minutes.

Bryan