Well, the strikes might have “totally obliterated” empty halls. Because the Iranians knew well before that those sites were in the crosshairs, and if they have the least bit of smart in them, they had moved everything of value to someplace else before the Americans came.

The indication of lack of radioactivity (according to the IAEC) means that either the bombs did not reach any life facilities, or that anything radioactive had already left the premises.

My guess is that those bunker busters simply hit empty rooms.