Underneath Gaza is a complex network of tunnels built by Hamas over the course of several years.
Also known as the "Hamas metro," the network has been described by the IDF as an underground city, which also expands beneath the borders and into Israeli communities near the Gaza border.
These tunnels were used to transport rockets and other weapons, as well as bunkers and Hamas command centers.
Other tunnels also exist underneath Rafah, the city along the Egyptian border, which are used to smuggle goods.
