The "bunker busters" are similar to the artillery shells that we developed back in the late 50's.
They're only a couple of kilotons, and the really amazing thing is that they are slightly "shaped". The explosion is very slightly directed down toward the ground. I certainly don't know how it's done, although I can imagine with neutron reflectors and some fairly exotic radioactives. It's real purpose is to "tunnel" down to the bunker, so that later conventional airstrikes can actually hit the thing.
I'd imagine the entire place would be clicking-hot, regardless of the "conventionality" of the weapons used.
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