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[–] KosherHiveKicker [S] ago  (edited ago)

Most controlled demolitions consist of multiple stages of explosions.

Preliminary rounds of sqibs simply weaken the structure to attempt to control the "flow" of the structure after the Final round of Squibs fire to initiate the actual collapse.

THE WTC WERE MASSIVE .... 100 stories plus.

The internal views shows the multiple timed explosions taking out internals first.