I don't know if I have seen that specific documentary,
but I did see a "Nova" which is a PBS documentary about why
the World Trade Center towers fell or more correctly, melted. As
luck would have it, the plane that hit the Pentagon in
Washington, D.C., hit the part of the building that had been
upgraded some time earlier to what was thought to be a more
modern way to build a more secure building. The windows were
shatter resistant. The walls were reen forced with mesh and other
materials that are not normally present. There were a number of
hardening measures that make things either fail to shatter or
fail to burn as easily.
The general consensus is that this all worked. Yes,
people did die and millions of Dollars of damage occurred, but
if that plane had happened to hit one of the other wings of the
Pentagon that is more conventionally built, more bloodshed would
have resulted.
The World Trade Center was built to withstand the impact
of large aircraft, but the engineers did not take in to account
the effect of flaming jet fuel on the steel support structure
which softened and then melted, allowing each floor to rip loose
from the supports and pancake on to the floor below it. The fire
suppression system had feed pipes along the tower walls. Had the
suppression system worked, it might have saved the building, but
it failed immediately when the burning jet fuel and impacts
severed those pipes. So, you had searing heat along with no
flood of water and that doomed both buildings.
Dane Trethowan writes:
> This Weekend marks the 10th anniversary of the September 11 attacks.
>
> I'm watching a very interesting documentary right now from our cable TV
> service called 9-11, The Towers And The Pentagon.
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