On September 11, 2001, 47-storey World Trade Center 7 collapsed—even though no aircraft had struck it.
Debris damage and uncontrolled fires affected the building for hours. NIST concluded that fire-induced structural failures near Column 79 triggered a progressive collapse. Its video analysis also identified a brief free-fall stage during the exterior’s descent.
But because the building appeared to fall rapidly and almost vertically, questions and alternative theories continue to surround WTC 7.
Was this an extraordinary fire-driven structural failure—or does the collapse still leave unanswered questions?
This video presents the documented events and disputed claims for educational and historical discussion.
Source: NIST WTC 7 Investigation
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