[Joe 6-pack]

The MOAB is an airburster...it detonates above ground and is for use against conventional military targets (i.e. troop formations, military bases, factories, etc.). This is designed specifically to to go after dug in, underground facilities, and will bury itself up to 180 feet into dirt, rock, concrete, etc. before detonating.

[SoCal Pubbie]

Would the targeting be precise enough to drop one, then another, then another til you've made your way through the bunker's roof, if it was thicker than one perpetrator could handle? Like hammering a chisel through a block of stone. The follow up with with a MOAB type bomb that detonate inside the structure for good measure?