This video is from a documentary titled Ants! Natures Secret Power. I saw it on BoingBoing recently, but it appears to have been around for years. Based on Bert Hölldobler’s research, it shows the excavation of a full sized leafcutter ant colony filled with 10 tons of cement ala Walter Tschinkel. Yup. I haven't seen the full documentary but the YouTube clip is amazing. What I really want to know is what happened to this ten ton cement colony afterwards?
If you happen to be in Oklahoma on March 24th, it appears that there will be a showing at the University of Oklahoma. The word on the street is that it is well worth watching.