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After nearly a decade of development, the U.S. Air Force has ordered
eight MOP (massive ordnance penetrator) GBU-57A/B bunker buster bombs.
These 14 ton weapons cost $3.5 million each. In the last few years,
several B-2 bombers have been equipped to carry these weapons (two bombs
per B-2). This was apparently meant to send a message to Iran and North
Korea. There were no known targets for such a weapon in Iraq or
Afghanistan, but there are plenty of such targets in Iran and North
Korea. Moreover, even were there deep bunkers in Iraq or Afghanistan,
you didn't need a stealth bomber to deliver a MOP. The enemy in those
countries have no way of detecting a high flying B-52, much less a
stealthy B-2.

But Iran and North Korea do have radars, and a B-2 could slip past
those radars and take out the air defense system command bunkers, or any
other targets buried deep. The 6.2 meter (20.5 foot) long MOP has a
thick steel cap, and can penetrate up to 7.9-61 meters (26-200 feet) of
concrete (depending on degree of hardness) or up to 61 meters of rocky
earth, before exploding.