This picture show's each floor of the Trade Center had an elevator shaft too follow all the way straight down!! Each floor was poured with concrete.On several floors the where big fuel oil tanks that served many purposes! With a big jet on fire stuck in the top of the tower, physics dictate's what would happen. My thought's are with the family's of the victim's that lost there lives on 9/11. What really happened at the Pentagon? That's my question? Peace!