I'm no pyrotechnical scholar ......but isn't it a touch risky to build a large skyscraper with explosives pre installed and allow it to sit for 25+ years? .....I understand the theory ....but I doubt the feasibility of it. It's just as easy to shut down sections of the building every now and then and install what ever is needed. It explains the power downs ....the relatively recent computer security electronics rewiring inder taken by Securacom a few years before ....and the random dust that would form over night in some offices that has been not only documented but video taped by one office. Great video .....but I just don't see how a structure that large and public can be constructed with explosives installed and nobody notice or accidentally weld a shaped charge whilst fixing that annoying loose handrail.