"MOABS"
A MOAB is a SURFACE weapon. Relatively useless for deep underground work. Might ruin and entrance but not much more.
Oops, guess a blast that would detonate all the boobie traps & landmines, kill all the surface troops, plus seal the entrances to their tunnels wouldn't work, huh?
Don't know if they have the "MOP" ready yet...
http://www.globalsecurity.org/military/systems/munitions/dshtw.htm