The Bunker Nightmare Goes Nuclear

Watch bunker busters in action.

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BLAST BELOW, BUT PLUME ABOVE
On December 18, 1970, a 10-kiloton nuke was detonated 900 feet beneath Yucca Flat near the Nevada Test Site, spewing a cloud of radioactive dust 10,000 feet into the air. Eight-six employees were exposed to radiation.

How the GBU-28 'bunker buster' works.
(Outside link to USA Today feature)

How 'thermobaric' bombs work.
(Outside link to USA Today feature)