The two sites that were hit are actually ventilation shafts left over from the original excavation, later covered and sealed. Think of the first Star Wars film, when Luke Skywalker dropped two proton torpedoes down a vent to blow up the Death Star’s reactor—same idea.

If twelve GBU-57A/B bunker-busters were used, they must have been delivered in pairs straight into those shafts. Both vents show clear signs of massive blow-out: scorched debris scattered all around. The burned rock is visible even in satellite imagery.
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