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NIST FOIA 09-42: R14-UC -- Main & Ballou 01-17 (Twin Towers Burning/Towers Collapse)

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Published on May 25, 2013

0:00:00 - Footage starts at 9:15:52 a.m. (uncertainty: 1 s), according to NIST's "Relative Time from Visual Analysis". A timeline based on seismic signals recorded and analyzed by Lamont-Doherty Earth Observatory of Columbia University and were used by NIST in their Cumulus data spreadsheet (MS Access file, obtained by some people through FOIA). This timeline is also included in the "FEMA 403 - WTC Building Performance Study".
Another timeline, mostly appropriated in their WTC reports, is the "Adjusted Time from Television Broadcasts" and is +5 seconds off of the first timeline above. It bases on the screen times of some 9/11 live news broadcasts.
For more information see NIST NCSTAR 1-5A (Chapters 1-8),
pp. xlviii & xlix / PDF pp. 50 & 51. Also the whole Chapter 3 of the same NIST subreport (pp. 19 through 24 / PDF pp. 115 through 120).

0:18:11 - A jet of smoke shoots out the window 77-355 at the east face of WTC2, around 9:37:01 a.m. (NIST's "RTFVA"). Smaller smoke "puffs" at the center windows of 78th floor at same face. Cumulus clip: Main & Ballou 06.
For more see NIST NCSTAR 1-5A (Chapters 9-Appendix C), p. 346 / PDF p. 50.

0:29:40 - Dripping/falling of molten substance becomes visible. End of zoom-in process at around 9:56:38 a.m. Large quantity of glowing material escapes at 0:31:14 (9:58:12 a.m.).
At about the same time a piece of debris is being expelled from somewhere of the impact hole at south face of WTC2 that is obstructed from view. Cumulus clip: Main & Ballou 10.

0:31:55 - Collapse of the South Tower starts at around 9:58:54 a.m. Cumulus clip: Main & Ballou 10.

0:51:45 - Large smoke expulsion occurs mostly on 92nd floor, north face of WTC1 at approx. 10:18:44 a.m.. Cumulus clip: Main & Ballou 15.
See also NIST NCSTAR 1-5A (Chapters 1-8), pp. 253-257 / PDF pp. 349-353.

1:01:15 - Main antenna on top of WTC1 apparently starts to shake. Global collapse begins at 1:01:19 (10:28:17 a.m.). Cumulus clip: Main & Ballou 17.
Core-remnant columns become visible at 1:01:31.


Northeast view (street level).
Grand Ferry Park near Williamsburg Bridge, Brooklyn.

Videographer/s: Tim Main & Mike Ballou


Recording start/end times from NIST Cumulus Video List:

0:00:00 - 09:15:52 to 09:20:10
Time Uncertainty: 1 [s]
Cumulus clip: Main & Ballou 01

0:04:18 - 09:20:17 to 09:25:10
Time Uncertainty: 1 [s]
Cumulus clips: Main & Ballou 02 and 03
(overlapping frames between clips have been removed)

0:09:12 - 09:26:11 to 09:33:06
Time Uncertainty: 1 [s]
Cumulus clips: Main & Ballou 04 and 05
(overlapping frames between clips have been removed)

0:16:09 - 09:34:58 to 09:41:49
Time Uncertainty: 1 [s]
Cumulus clips: Main & Ballou 06 and 07
(overlapping frames between clips have been removed)

0:22:59 - 09:49:33 to 09:50:56
Time Uncertainty: 1 [s]
Cumulus clip: Main & Ballou 08

0:24:23 - 09:51:22 to 10:30:45
Time Uncertainty: 1 [s]
Cumulus clips: Main & Ballou 09-17
(overlapping frames between clips have been removed)


NTSC DV files deinterlaced (BFF order) and decompressed. Vertical black borders cropped, resolution upscaled while keeping aspect ratio, sharpness, color saturation and contrast encreased. Chroma noise has been lowered by a HQ denoising filter. Audio stream has been resampled, 32 kHz to 48 kHz by a 129 taps filter of Virtualdub.


NIST FOIA 09-42
Release #14 - Complete Uncompressed Set
Subfolder: Tim Main & Mike Ballou
Joined clips: Main & Ballou 01-17
(overlapping frames between long clips removed).

Source: 911datasets.org

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