Resident of Iranian Town Discovers Enormous Underground City While Digging Sewage Ditch in His Home

Hole leading down to sub-levels 2 and 3. Image credit: Blondinrikard Fröberg
The entrance to the underground city was hidden and camouflaged, and there were several ways to access it from different parts of the town. Some entrances were located inside the houses of people, and others were in public places such as the main fort.

The underground city was designed in such a way that it was easy to defend and hard to invade. The passages were narrow and curvy, allowing the inhabitants to ambush the enemies. There were also deep holes covered with rotating stones that would trap anyone who stepped on them.

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