H006
Explosives contributed to WTC7 failure
Competing proposition: explosives or other additional energetics contributed to WTC 7's collapse. Inputs include NIST's own free-fall stage, Hulsey 2020, Harrit chips, Silverstein 'pull it', BBC premature report, Jennings/Hess. Official origin of a negative finding does not remove this hypothesis from the board.
Likelihood — more or less than 50%
63%
More than 50% — weakly supported by the sources
Start at 50%. Move by half of the net source score after uncertainty. Net source score is 0.32 (from −1 contradict to +1 support). Uncertainty is 17%. So 50% + 50% × 0.32 × 83% remaining certainty = 63%.
0.5 + 0.5 × 0.32 × (1 − 0.17) = 0.633
Recalculate with sourcesAdversarial challenge
- Contradicting objects: 3
- Supporting objects: 11
- Distinct source classes: 4
- Objects with a zero quality dimension: 2
Version history
v1 · 2020-03-01 · conf 0.38 · unc 0.50
Free-fall stage, Hulsey, Harrit, FDNY, Silverstein clip vs NIST no-explosives. Open; not a verdict.
v2 · 2023-06-01 · conf 0.42 · unc 0.48
After Chandler/Walter/Szamboti 2023 multi-point WTC 7 roofline paper. Kinematic tension with NIST Stage 1 characterisation rose; chemical identification of explosives did not.
supports6
NIST FAQ: WTC 7 north face had a 2.25-second free-fall stage
NIST WTC investigation FAQs (towers and WTC 7) · 2019-11-20
NIST measured a 2.25-second free-fall stage of WTC 7's north face and described negligible support from the structure below.
human_seed · seeded · 2.25 s free fall with 'negligible support from the structure below.'
Harrit et al. 2009: active thermitic red/gray chips in WTC dust
Harrit, Farrer, Jones, Ryan et al., The Open Chemical Physics Journal 2:7–31 (2009) · 2009-04-03
A 2009 peer-reviewed paper reports energetic red/gray chips in WTC dust that the authors identify as unreacted thermitic material.
human_seed · seeded · Thermitic chips, if correctly identified, are a candidate energetic.
Hulsey et al. (UAF): fire did not cause the observed collapse of WTC 7
Hulsey, Quan, Xiao — University of Alaska Fairbanks WTC 7 study (2019–2020) · 2020-03-01
A University of Alaska Fairbanks team published a model concluding fire did not cause WTC 7's observed collapse.
human_seed · seeded · UAF model: only near-simultaneous column failure matches observation.
Piers Robinson — Researching 9/11 and Beyond: Current Knowledge and Future Directions (Aug 2024)
Journal of 9/11 Studies · 2024-08-01
Robinson's 2024 survey cites Harrit 2009, Hulsey 2020, MacQueen eyewitness counts, NIST NCSTAR, the Commission, Ashton v KSA, and a 2023 Klarenberg claim of a CIA-Saudi recruiting operation involving two hijackers. He states official investigations are flawed and demolition of WTC 1/2/7 is most likely.
human_seed · seeded · Robinson 2024 survey treats demolition of 1/2/7 as most likely. Secondary.
Chandler, Walter, Szamboti — Instantaneous free fall of WTC 7 and NIST's attempt to hide it (Jun 2023)
Journal of 9/11 Studies · 2023-06-01
Using multi-point tracking, Chandler/Walter/Szamboti report that after ~1.4 s of near-immobility of most of the north and west rooflines, those rooflines entered free fall together within ~0.2 s at ~8.0–8.2 s after east-penthouse collapse, ~9.8 m/s² for ~2.5 s.
human_seed · seeded · Multi-point free-fall onset is the authors' kinematic support for simultaneous support removal.
David Chandler — WTC 7: A refutation of NIST's analysis (Toronto Report ch.9)
The 9/11 Toronto Report (2012), International Hearings on the Events of September 11, 2001 · 2012-09-11
Chandler's 2012 hearing paper treats NIST's own Stage 2 free-fall interval as established and argues the 5.4 s overall figure is an artefact of start-time choice.
human_seed · seeded · 2012 Chandler free-fall argument, precursor to 2023.
weakly supports5
FDNY oral histories: multiple firefighters report explosions
New York Fire Department oral histories (released 2005 after lawsuit) · 2005-08-12
Multiple trained first responders independently described explosion-like events at the WTC site on 11 September 2001.
human_seed · seeded · Explosion language in responder histories, including some WTC 7 reports.
9/11 Commission did not investigate WTC 7's collapse mechanism
9/11 Commission Report · 2004-07-22
The 9/11 Commission did not produce a collapse-mechanism finding for WTC 7.
human_seed · seeded · The political enquiry did not examine the building that alternative investigators consider most diagnostic.
Barry Jennings and Michael Hess: explosions and being trapped in WTC 7
BBC World — Jane Standley live report of WTC 7 collapse (11 September 2001) · 2001-09-11
Jennings and Hess were trapped in WTC 7 and described explosion-like events and delayed rescue.
human_seed · seeded · Jennings/Hess explosion-in-WTC7 accounts; clock time disputed.
AE911Truth petition: thousands of architecture and engineering signatories dissent from NIST
Architects & Engineers for 9/11 Truth (Richard Gage and associated filings) · 2019-01-01
A public petition of architects and engineers calls the official collapse explanations incomplete and asks for a new investigation.
human_seed · seeded · Professional dissent count — popularity is not a mechanism.
Graeme MacQueen — 156 eyewitnesses describing explosions at the Twin Towers (Toronto Report ch.8)
The 9/11 Toronto Report (2012), International Hearings on the Events of September 11, 2001 · 2012-09-11
MacQueen compiled 156 accounts, mostly FDNY oral histories, in which speakers used explosion/bomb language about the towers; he documents both the original wording and some later retractions.
human_seed · seeded · Explosion language is mostly about the twin towers; some WTC 7 reports exist in the oral histories.
neutral2
IC911 Data Archive — links inactive at ingest
International Center for 9/11 Justice · 2026-09-02
As of 2 September 2026 the IC911 data-archive page states that archive links are inactive and that a large archive of videos, photographs, and documents is being built.
human_seed · seeded · Inactive archive. Zero weight.
IC911 presentations catalogue (2023–2026)
International Center for 9/11 Justice · 2026-09-02
IC911 lists seven presentations 2023–2026 on flight simulation, seismic claims, hijacking, air defence, the North Tower spire, and WTC 7 free fall.
human_seed · seeded · Presentations catalogue. Weight lives in the cited papers, not the slide list.
indeterminate1
Larry Silverstein, PBS 2002: 'maybe the smartest thing to do is pull it'
PBS — America Rebuilds: A Day with Larry Silverstein (2002) · 2002-09-10
The leaseholder said on camera that he suggested they 'pull it' regarding WTC 7 and that a decision to pull preceded the collapse they watched.
human_seed · seeded · 'Pull it' is about an order, not a chemical identification.
weakly contradicts1
NIST / critics: red/gray chips consistent with primer paint, not thermite
NIST WTC investigation FAQs (towers and WTC 7) · 2019-11-20
NIST and subsequent paint-chemistry arguments attribute the red chips to known coatings rather than explosives.
human_seed · seeded · Paint rebuttal of the chips.
contradicts2
NIST NCSTAR 1A: WTC 7 collapse initiated by fire-induced buckling of Column 79
NIST NCSTAR 1A — Final Report on the Collapse of World Trade Center Building 7 (2008) · 2008-11-20
NIST attributes WTC 7's collapse to fire-induced failure beginning at Column 79, with global collapse at 17:20.
human_seed · seeded · NIST fire-only probable sequence.
NIST: no corroborating evidence for explosives or thermite
NIST WTC investigation FAQs (towers and WTC 7) · 2019-11-20
NIST published a negative finding on explosives and thermite as collapse causes.
human_seed · seeded · NIST no-explosives finding.
Human review can dispute any AI or seeded link. Seeded links are labelled and are not silent overwrites.
Open review queue