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The remarkable photo ABOVE, taken after a considerable amount of demolition work had been done, reveals an actual cross-section of the three connected rings of the Pentagon. Notice the number of columns and walls that would have to be cleanly penetrated to blast completely through this massive concrete, brick and limestone structure. And consider that to pass through at a 45 degree angle, a projectile would have to plow through nearly 100 additional feet of concrete obstacles, the equivalent of approximately 1½ more rings.
The distance from the alleged point of penetration to the alleged exit wound was just over 300 feet. For you sports-minded readers, that's an entire football field. Imagine that across each goal line of that football field is a 24" thick, steel-reinforced masonry wall. And down each sideline as well. Imagine also that every five yards or so, across the entire field, in both directions, are 24" square, reinforced concrete columns. Now imagine that there are several concrete slabs spanning between that network of columns, each five-and-a-half inches thick, spaced about fourteen feet apart. Now add some concrete ramps here and there to connect the floors. What we have then, so far, is something the size of a football field that closely resembles a walled, multi-story parking structure. Now add to that, every four or five yards, interior walls, some masonry and some of lightweight construction. Don't forget to add them in both directions, across the entire width and length of the field. If you'd like, you can also add file cabinets, desks, and various other bulky office furnishings, but that's really optional. The important thing here is to consider how likely it would be that a 757 flown into the fortress wall at one end of the field would blast its way through a hole in the fortress wall at the other end of the field. I'm guessing not very likely at all.