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TUNNEL WARFARE - IRAN'S GRANITE MOUNTAIN FORTRESS - BUNKER BUSTERS YET TO PENETRATE Iran's Yazd Imam Hussein Base is no ordinary bunker. Carved deep into Shirkuh granite, one of the hardest rocks on Earth, this mountain fortress makes America's most powerful bunker busters completely ineffective. The mountain is made of Shirkuh granite, which can withstand crushing pressure of 25,000 to 40,000 pound-force per square inch (PSI).
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