This structure known as Chincana - which means “labyrinth” in Quechua.

It is longer than a mile under the streets of the historic Peruvian city of Cusco.

'They first dug trenches, and then supported them with stone walls and carved-beam ceilings. "

https://www.popularmechanics.com/science/archaeology/a63433942/underground-inca-labyrinth/