The myriad tunnels under Gaza are best known as passageways used to smuggle goods from Egypt and launch attacks into Israel.
But there exists a second underground network that the Israel Defense Forces colloquially refer to as the “Gaza metro.” It’s a vast labyrinth of tunnels, by some accounts several kilometers underground, used to transport people and goods; to store rockets and ammunition caches; and house Hamas command and control centers, all away from the prying eyes of the IDF’s aircraft and surveillance drones.
Related
What Friends Owe Friends (Richard Haass, F Affairs)
An Invasion of Gaza Would Be a Disaster for Israel (Marc Lynch, F Affairs)
What Israel Will Face in Gaza (Daniel Byman and Seth G. Jones, F Affairs)