The Iranian government put its key nuclear facility about 300 feet below ground at Fordow. A quick look at the area with Google Earth shows that it’s a mountainous area, and all that rock over the enrichment facility would seem to be pretty good protection. But just like a police officer wearing body armor, the appearance of invulnerability is deceiving. The United States put NORAD’s facility about 2,000 feet below the top of Cheyenne Mountain for the same reason. The granite overhead offers great protection from attack, with Cheyenne Mountain designed to withstand a 30-megaton nuclear blast from 1.2 miles...