Originally Posted by Rochard

There really wasn't anything in the ground lobby - it was really just a vast open space. Maybe a few minor things caught fire, but that was either quickly burned out or put out. While it was enough to burn people, it was nothing but granite and windows.

But being as fireball traveled down to the ground level, it must have hit the basement levels too. Everything under the sun was in the basement. Air conditioning transformers, entire power plants, tens of thousands of gallons of oil....