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TL;DR: There is nothing that can possible bust bunkers except nuclear bombs. We just nuked Iran's nuclear facilities, like we've nuked other places before, but we lied about using nukes.

Counterpoint: If there were nuclear blasts, everyone in the world would know it almost immediately. Nuclear detonations create exotic radioactive materials that are easily detected halfway across the world.

Furthermore, once you get underground, the denser the material the stronger the shockwave can be. It's why you can't create a bomb with black powder in the open. It just burns very quickly. Once you seal a strong enough container around the black powder and ignite it, it can explode.

Explosives behave like this. There are exotic explosives that have much better characteristics for busting bunkers than TNT that can be used.

Also: The "mushroom cloud" that you saw after the blasts are always created with large enough bombs. You don't need a nuclear bomb to create small ones.