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“We've been building underground bases since before [WWI] that were pretty impressive. But that's when we were really learning. It really didn't become a real pressing matter to have deep, underground military bases until the nuclear age, and until the age of having not only nuclear weapons but delivery systems that were sort of like bunker busters, that could deliver nuclear weapons deep under the rock strata before detonating. So they had to keep up with the weapons systems that were being developed. As the weapon systems were being developed to take out deep, underground military bases, the deeper they went, and the more sophisticated they became.