How Iran's IRGC Built Hezbollah's Underground Cities

Israel's media tours of Hezbollah's underground complexes in South Lebanon have revealed something far beyond crude smuggling tunnels: forty-to-eighty-meter-deep command centers with blast doors, rail systems, and industrial ventilation. Military analysts and journalists point to engineering details that match Iran's IRGC Engineering and Construction Headquarters exactly — from blast door tolerances to rail gauges to geological site selection. This episode breaks down the specific engineering signatures — depth profiles calibrated to Israeli bombs, positive-pressure life-support systems, and hydraulic blast doors — that make the Iranian fingerprints unmistakable. What does it actually take to build an underground city, and why couldn't Hezbollah have done it alone?