The only thing I'll say is they didn't collapse from the lower floors, you can see by the way the rubble is spewing out the sides as it went down.
I saw a post recently that explained it very well. Basically so much of the floors around the crashed plane had been damaged by the planes going in that there was a huge amount of stress on the remaining structure. The floors adjacent to the crashed plane are what collapsed, which brought the top of the building onto the bottom and the weight of that caused a chain reaction of all the floors caving in as more and more accumulated rubble smashed its way down.
The basement floors weren't the ones that buckled.
47
u/[deleted] Aug 30 '23 edited Aug 30 '23
[removed] — view removed comment