Nice animation by the Union of Concerned Scientists.
Why nuclear bunker busters are bad:
- They can't reach the deepest bunkers.
- Rather than destroying chemical weapons, they may release them into the atmosphere.
The animation proposes an alternative weapon/strategy for dealing with underground bunkers. I highly doubt that Iran has any significant weapons worth starting a war over, but the UCS suggestion at least makes more sense than using nuclear weapons. It's a step toward rational thinking and much appreciated.