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WTC 7 "collapse" (MSNBC live)


mp3228
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WTC7 = amphitheater lobby design. Amphitheater design = first couple floors completely open, no support except for outer support =much weight on outer 4 columns of whole building [~2000 sq. ft. of floor area for each floor]. WTC has emergency generators full of diesel fuel. Debris crashes into and destroys large part [about 10 stories of the south face] of WTC7. Fires start. Fires = fueled for hours by generators. Combined damage + fires + unusual construction = collapse.

 

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