Quote Originally Posted by aids View Post
Great questions maybe all the gas has escaped by now its almost been a year since it all started and as for them loosing numbers to an earthquake idek lol underground could still be safer than above ground to them they want to survive just like the humans
I don't know because of the higher risk of caving in and such. I can't see the zombies wear hardhats and singing "Everything is awesome" as they build complex and stable tunnels.