9/11 Demolition Analysis of the North Tower - Looking at the the massive ground shaking just before the collapse and the corresponding acceleration and intensifying of smoke from the roof area of world trade center 1.
This short clip was made to show part of the mechanics of the demolition of the north tower (WTC1)
It appears that there was an initial mini demolition at the top of WTC1, you can see the core is taken out as the antenna falls at the onset of collapse. This method created a shroud of dust and debris that attempted to (but failed) hide the demolition blasts and squibs.
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