WTC 7 Engineering Papers, Collapse Hypotheses,
Witness Accounts and Photographic Evidence, Misc. WTC 7 links

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August, 2008: NIST's draft report on the collapse of WTC building 7 has been released for public comment. Click here to download the full report in pdf form. NIST's press release and other material on the report can be found here. Video of NIST press briefing about the release.

6 Debunked Conspiracy Claims from Today's NIST (WTC 7) Report.

July, 2008: The BBC TV program I'm in briefly, "The Conspiracy Files–9/11–The Third Tower" is an outstanding examination of why the WTC 7 conspiracy theories are nonsense.

How the loss of 1 column may have led to the collapse of WTC7 (Structure magazine, Nov., 2007 pdf)

The Collapse of Building 7 (Jan., 2007, pdf) By Arthur Scheuerman, Battalion Chief FDNY (Retired), Former Deputy Chief Instructor Nassau County Fire Training Academy and high-rise Fire Safety Director

FEMA 403, Chapter 5 (2002, pdf): Design and construction of WTC building 7, fire protection systems, building loads, timeline of events, and potential collapse mechanisms and sequences.

Ryan Mackey on FEMA's "low probability" statement about WTC 7

NIST NCSTAR 1-8 (pdf) The Emergency Response Operations.

NIST NCSTAR 1-1J (pdf): Design, Installation, and Operation of Fuel Systems for Emergency Power in World Trade Center 7

NIST presentation: "WTC 7 Technical Approach and Status Summary", December 12, 2006
NIST Status Update on World Trade Center 7 Investigation, June 29, 2007

FDNY Chief of Department (ret.) Daniel Nigro Addresses WTC 7 Conspiracy Theories
(Thanks, Ref!)

WTC 7 and the Lies of the 9/11 Truth Movement – My examination of how the conspiracist claims of WTC 7's condition and collapse correspond to reality, with numerous first responder accounts.

Visit the excellent WTC 7 section of

John Salvarinas: "Seven World Trade Center, New York, Fabrication and Construction Aspects" (PDF)
Canadian Structural Engineering Conference, 1986 (Thanks to for tracking this down.)

Physicist Dave Rogers on the illogicallity of demolition claims for WTC 7

Miscellaneous WTC 7 links

Analysis of WTC 7 Steel (Barnett & Biederman)
WTC 7 collapse discussion PhysOrg Forum
NIST Contract to ARA for investigation of WTC 7
WTC 7 was severely damaged and was on fire for hours
Account of WTC 7 Engineer Michael Catalano
Silverstein "Pull" comment explained by spokesman
NEW WTC 7 building photo gallery
Engineers Have a Culprit in the Strange Collapse of 7 World Trade Center: Diesel Fuel ($ NYT Nov 29, 2001)
City Had Been Warned of Fuel Tank at 7 World Trade Center ($ NYT Dec 20, 2001)
Burning Diesel is Cited in Fall of 3rd Tower ($ NYT March 2, 2002)
NDBoston, in WTC 7 on 9/11, on debris there
WTC 7 Lobby damage
Popular Mechanics responds to Rosie O'Donnell's comments
As pointed out by, the gash in WTC 7's south face lines up with WTC 7's emergency generator fuel distribution system.
Kevin McPadden says WTC 7 expected to fall due to structural damage
Barry Jennings timeline as told to NIST
NBC News Dan Abrams Reporting WTC7 may collapse at 4:54
WTC 7 fire NBC Reports Building 7 At Risk
WTC 7 fires and south side hole

Firefighter Miller of Engine 15 says WTC 7 coming down.
"You see the white smoke, you see the thing leaning like this? It's definitely going. There's no way to stop it. 'Cause you have to go up in there to put it out, and it's already, the structural integrity is not there."

"Pull it" – another use.
"Right where we were almost when the first building collapsed, there was a huge  collapse, a big wall of stuff, and it was on fire. Eric found a house line, and he grabbed the house line and he was saying, "Let's pull  it."  We pulled it over, and we got caught up on some stuff, he came back, helped me pull it out.  I went to turn the wheel of the gauge and there was no pressure.  There was water in it, but you could squeeze it closed."  FDNY Firefighter James Murphy packages/pdf/nyregion/20050812_WTC_GRAPHIC/9110323.PDF

WTC 7 collapse quotes

Dennis Smith, Ret'd FDNY: "All of a sudden, the forty-seven story building before us begins to shake. 'It's coming down,' someone yells, and everyone gets poised to run in the opposite direction. It falls almost as if in slow motion, sinking straight down, and then leans to the south, leaving most of its rubble against the north wall of building 6.  (Report from Ground Zero by Dennis Smith. Penguin, 2002. p. 176)

Charlie Vitchers: "I had a clear view down Washington Street of Building Seven, which was on the north edge of the site. All forty-seven stories were on fire. It was wild. The MPs said the building was going to collapse. I said, "Nah, I don't know." And then all of a sudden I watched the building shake like an earthquake hit it, and the building came down." (Nine Months at Ground Zero by Glenn Stout, Charles Vitchers, and Robert Gray Scribner, 2006. p. 15-16)

Bobby Gray: "Suddenly we saw firemen running and yelling, "Seven's going to go, seven's going to go!" Seconds later, Building Seven is gone. I watched the northeast corner of the roof kind of buckle and then the building came straight down. Clouds of dust rolled and blew down the side streets like a hurricane going horizontally. (Nine Months at Ground Zero by Glenn Stout, Charles Vitchers, and Robert Gray Scribner, 2006. p.17)

Steve Spak Video

WTC 7 Steve Spak photo analysis