Here's an educational video for you. Ever wonder what ant colonies look like underground? Well this video show what happens if you fill a giant ant colony with a thin concrete mixture, let the concrete dry and then dig it all up.
When I was in college, I played a game called SimAnt for a few days. Not nearly as cool as this though. I'm guessing my backyard ants do pretty much the same thing on a smaller scale. Pretty amazing if you ask me! How they get air that deep I can't figure out.