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At 5:20:33 pm EDT on September 11, 2001, 7 World Trade Center started to collapse, with the crumble of the east mechanical penthouse, while at 5:21:10 pm EDT the entire building collapsed completely.[1] There were no casualties associated with the collapse.
according to Wikipedia.
Ahhh, so it was the same day. I still remember audio though of them saying we are going to pull it, which in demo terms is bring it down. But my memory sucks!!
the audio you heard didn't bring out the conspiracy theorist, it brought out engineers and physicists.
spelling win!
From what I know about demo, which isn't a hell of a lot, is for towers they calculate the weight it would take to collapse the entire building at a certain point. They then determine what floor that would happen at and set that floor and 1-2 up and down, depending. Then pull it which causes the building to collapse in itself.
So using liquid explosive, it could be set up rather quickly.
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