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I think releasing the tapes would piece together more of what happened, and either enhance or diminish the conspiracy nut claims that the World Trade Centers were blown up from the inside out.
Myself I think a plane took the buildings down, not some planned implosion. For one, implosions take months and months of planning AND require the building to be FULLY EMPTY.
Sticks of dynamite must be placed in the correct spots with certain sections of main load-bearing columns cut to keep the building from swaying in one direction or another.
Toppling the World Trade Center towers (105 to 110 floors tall?) would require inteligence and planning beyond my imagination since you would have to take into effect the winds at that high altitude.
Also any reports of implosions would go against people that were in the building before and as it collapsed. Also, there is ZERO chance that thousands of people who fleed the WTC Towers could all be paid off to keep quiet.
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The Pentagon crash.
Loons like Alex Jones (find him on Wikipedia or PrisonPlanet.com, I won't link to him) believe that the Pentagon was attacked by a truck bomb or some similar explosive.
1. There was a video of a gas station that clearly showed a plane hitting the Pentagon for a few video frames.
2. The airplane was near the ground, before hitting the Pentagon. Once it hit the Pentagon, itś wings were stripped off due to the speed. The hole that remained was the side of the passenger compartment of the plane.
There's more on the wikipedia page for 9-11 conspiracies.
-Jesse