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5. Squib-timing during the Collapse of WTC 7
Horizontal puffs of smoke and debris are observed emerging from WTC-7 on upper floors, in regular sequence, just as the building starts to collapse. (The reader may wish to view the close-up video clip again.) The upper floors have evidently not moved relative to one another yet, from what one can observe from the videos.
In addition, the timing between the puffs is less than 0.2 seconds so air-expulsion due to collapsing floors (see Chertoff, 2005) is evidently excluded. Free-fall time for a floor to fall down to the next floor is significantly longer than 0.2 seconds: the equation for free fall, y = ½ gt2, yields a little over 0.6 seconds, as this is near the initiation of the collapse.
However, the presence of such “squibs” proceeding up the side of the building is common when pre-positioned explosives are used, as can be observed at www.implosionworld.com... The same site shows that rapid timing between explosive squibs is also common. (It is instructive to view several of the implosion videos at this web site.) Thus, squibs as observed during the collapse of WTC 7 going up the side of the building in rapid sequence provide additional significant evidence for the use of pre-placed explosives. Release by the government (NIST, in particular) of all videographic and photographic data showing details of the fires, damage, and collapse of WTC 7 on 9/11/2001would allow us to analyze these squib data in greater detail, to determine whether breaking windows or explosive charges are evidenced in the observed puffs of smoke. Horizontal plumes and sounds of explosions are even more pronounced in available videos of the collapses of the WTC Towers (see sections 7 and 8 below).
Regarding this highly-secure building, a NY Times article entitled “Secretive C.I.A. Site in New York was Destroyed on Sept. 11,” provides an intriguing puzzle piece:
The C.I.A.'s undercover New York station was in the 47-story building at 7 World Trade Center… All of the agency's employees at the site were safely evacuated… The intelligence agency's employees were able to watch from their office windows while the twin towers burned just before they evacuated their own building. (Risen, 2001)