Gundam GQuuuuuuX takes place in the Universal Century or at least an alternate reality to the one seen in the classic Mobile Suit Gundam 0079. In this timeline, shortly after the Earth Federation ...

This is exactly the effect of a bunker buster like the BLU-109. The bomb’s tough casing allows it to penetrate deep underground with its delayed fuzing detonating the warhead at a predetermined depth ...