english: They were consistently dug as limestone quarries and by the 18th century, the caving-in of some of these quarries posed safety threats, so the government ordered reinforcing of the existing quarries and dug new observation tunnels in order to monitor and map the whole place.
non_english: Kopani su sistemski i služili su kao kamenolomi i do 18. veka urušavanje ovih struktura je predstavljalo pretnju po sigurnost pa je vlada naredila podupiranje postojećih kamenoloma i kopanje novih tunela za nadzor da bi se cela oblast unela u karte i nadgledala.