Geez....I remember reading about the MOAB, mother-of-all— bombs, back way before I retired 5 years ago. As I recall it was a variation on the FAB (fuel-air-bomb) coupled with some hot sh!t penetrating poser......At the time a company called Dynetics produced it. A damn big munition as I recall.
I think the FAB was a gasoline air burst to level trees for an LZ. This one seem to be a penetrator using metal powders. Both have thermobaric effects
Didn’t we flatten the Tora Bora mountain range & its caves with something similar?