Could Iran's Ultra-Tough Concrete Withstand Bunker-Busting Bombs? -- Popular Science
Iran may not impress us with its flying saucer drones, but the country does at least one thing better than anyone else: Make concrete. Iran is in an earthquake zone, and its engineers make some of the world’s toughest building materials, which could conceivably withstand small earthquakes.
Or, as it happens, artificially-induced earth shaking. Like from bombs.
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My Comment: Oh oh .... another uncertainty for the Pentagon (and Israeli) planners to work out a successful plan of action against Iran's protected nuclear facilities.