Yes we do. Lt. General McTierney (I think that is how you spell his name) said a few days ago we have a 30,000 lb mega bomb that can penetrate anything in Iran and their facilities can be breached by it.
The entire country is full of ancient tunnel systems, some shallow and some very deep. Some of them are very large.
A few thousand "penetrators" doesn't have a chance of doing enough damage.
They'll have to be burned out of their holes.
The Russians, Azeris and others living down-wind (which is to the North around the Caspian) would prefer we not use something with nuclear fallout.
I think it’s something like McInerny.