The Instantaneous Free Fall of World Trade Center Building 7 and NIST’s Attempt to Hide It

by David Chandler, Ted Walter, and Tony Szamboti

June 2023

In the most comprehensive measurements of Building 7’s downward motion to date, Chandler, Walter, and Szamboti show that the transition to free fall was instantaneous and simultaneous across the entire measurable width of the building’s roofline.

David Chandler, Ted Walter, and Tony Szamboti have all produced highly influential work on Building 7 over the past decade and a half.

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