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Actually, they're hardened to withstand a strike by a fully-loaded plane. Have you ever seen the way they are built? If not, you cannot comprehend how unbelievably tough they are. IIRC, Millstone's silos will withstand a hit from a 16" battleship round (2500lbs of HE traveling half a mile per second) without failure. My friend was on the crew overhauling one of them...they may be the closest thing to indestructible that has ever been built.