Quote Originally Posted by AuGmENTor
Good point Dark. I too understand the concept, and feel about the same as you do about it. It COULD work however, as plastic explosive is detonated by and electrical current, and not shock or vibration. They COULD have just waited and shoved in the detonators when they were ready. I have know Idea what the shelf life of C4 is though... And that wouldn't explain merrily melting steel pouring out of windows either.
All high explosives are detonated by pressure. Speed equals pressure and electricity has the speed to do it although it is difficult to get the arc from a spark contained with high explosive enough to exert the pressue on the explosive. That is what initates a blasting cap which is filled with a very sensitive high explosive in a small tight area to facilitate the chain reaction.

The powerdown provided the time to set detonators in the floors and perhaps the upper core area. The security phone schematics from securacom facilitated designing a system using digital counters with the appropriate delays and the effect seen.

I too feel some thermite was used above ground level as a distraction at the very least but it appears by the molten metal pouring out of WTC I think it was that perimeter box columns may have been cut to facilitate WTC falling east as it did. Most of the thermite was in the basement however. Tons of it to severe the huge interior box columns which not even explosives could cut effectively.

The 1993 bombing provided and excuse for a remodel and the installation of that.