What about the Explosion? - Figure D18-1: A curious hole room about 18" in diameter in the roof of the concrete invited such speculation and interest that the agents bulldozed the structure on April 30, within two weeks of the fire. Seven years later, a Special Counsel investigator concluded that the hole was "spalling" from age and heat damage. But the rebar is relatively free of the corrosion and concrete debris one would expect of spalling. (Exhibit USAWDTX 086-00897 catalogued by the US Attorney, Western District of Texas via Michael McNulty via Wikimedia) Next →