How to make a giant aluminum ants’ nest

Details about that amazing aluminum nest cast photo that is making the rounds. It's SCIENCE!

Tschinkel W.R. (2010). Methods for Casting Subterranean Ant Nests, Journal of Insect Science, 10 (88) 1-17. DOI: 10.1673/031.010.8801

Tschinkel W.R. (2004). The nest architecture of the Florida harvester ant, Pogonomyrmex badius., Journal of insect science (Online), PMID: 15861237