In the present essay, I focus on one question: why the Twin Towers and building 7 of the World Trade Center collapsed. One advantage of this focus, besides the fact that it allows us to go into considerable detail, is that the destruction of the World Trade Center provides one of the best windows into the truth about 9/11. Another advantage of this focus is that it will allow us to look at revelations contained in the 9/11 oral histories, which were recorded by the New York Fire Department shortly after 9/11 but released to the public only in August of 2005.

On the weekend of [September 8-9, 2001], there was a “power down” condition in . . . the south tower. This power down condition meant there was no electrical supply for approximately 36 hours from floor 50 up. . . . The reason given by the WTC for the power down was that cabling in the tower was being upgraded . . . . Of course without power there were no security cameras, no security locks on doors [while] many, many “engineers” [were] coming in and out of the tower.[58]