"A measure of abnormal long put volume was also examined and seen to be at abnormally high levels in the days leading up to the attacks. Consequently, the paper concludes that there is evidence of unusual option market activity in the days leading up to September 11 that is consistent with investors trading on advance knowledge of the attacks".[67] —Allen M. Poteshman, The Journal of Business
I'm not an engineer but I lived somewhere that used to be known for having a big bonfire and that shit would smolder for weeks and it was childsplay compared to two towers filled with 30 years worth of paper.