You can clearly see the chambers connected by the tunnels, really an amazing work of nature.That's like a mega city compared to the ant size respectively. Never really saw an entire colony cast like this. Awesome.This video inspired me to start melting aluminum in my back yard, I then used that experience to get hired at a foundry.Imagine the ants that went out for a late night walk and coming back to see a crater where their home was.It's remarkable how aluminium flows to the farthest ends of the colony without hardening and clogging halfway.