DESCRIPTION: The graph will give you some technical structural information. The photo on the left most likely represents a "red" column in their key-code. The center photo corresponds to the beige colored rectangle that they refer to as the "Slab deflected upward". The photo on the right is from the inside of what they call the "Hole in wall", otherwise known as the punch-out or exit hole. See the Exit Hole page for more information on this.

I have not been able to find any photos or information on the area they refer to as the "opening through roof". This would have been two stories here and as we know the aircraft stayed below the floor 2 slab except in the small area where it was deflected upward in the above photo.

Try to draw a line from anywhere in the imapct zone to the "hole in wall" and imagine either an object or a ball of debris that could create a crisp 9 foot diameter hole.