The system also included a series of tunnels carved into the rocky terrain, channeling water through underground passages to different districts of the city. These tunnels protected the water from evaporation and contamination, ensuring a reliable supply throughout the year. Some of these tunnels extended for hundreds of meters, and their precise alignment and slope demonstrate the use of surveying techniques that were far ahead of their time. They also contributed to the city’s defense by providing hidden routes and access to fresh water during sieges or droughts.
