They dug a pit under it, then it sunk down... then they tugged it off into a side tunnel.
I want my funeral to work like that. It was awesome.
In a few days I'll try to get a time-lapse of them doing this... if I can just keep them from sticking dirt on the the front glass... this is why I didn't want to give them dirt. They are very creative and have made all sorts of abstract mud sculptures and curvilinear forms tufted with moss. Who knows what lurks in the ant mind!