I’ve heard it sucks the oxygen out of the tunnels, asphyxiating the guys hiding fairly deep in the mountain.
I read about it here like over a decade ago.
Blast radius of 1 mile.
In WW-II, marines were assured that after massive air and naval barrages against tiny atols, they would go in unopposed.
I believe the November Hellfires can do it in smaller scale. Soldiers would go in to finish clearing the buildings and come out vomitting talking of dudes with lungs aspirated out of their faces exploded with eyes and guts popped out.
FTL: For the Lazy
GBU-43/B Massive Ordnance Air Blast
https://youtu.be/zghQeYm7FUs
Other Videos - GBU-43 (MOAB) :
https://www.google.com/webhp?hl=en&tab=ww#q=GBU-43&hl=en&tbm=vid
https://en.wikipedia.org/wiki/GBU-43/B_Massive_Ordnance_Air_Blast
(...excerpt...) At the time of development, it was touted as the most powerful non-nuclear weapon ever designed.[2] The bomb was designed to be delivered by a C-130 Hercules, primarily the MC-130E Combat Talon I or MC-130H Combat Talon II variants.