Ten tons of cement were pourred into this grasscutters ant colony, revealing a subterranean structure of 8 meters / 26 feet deep. 'Ant-City' was built including circulating ventilation shafts and funghi gardens interconnected through pipelines.
Assuming that this is the work of a collective mind – would be logical. But then; imagine how would advanced aliens – studying earths cities – describe our architectual skills? Hence the real question should be: "How do aliens communicate?!"