During the last 10 seconds before launch the Space Shuttle performed thousands to operations to turn on the engines, safely bring them to speed and leave the launch pad. There's dozens of engineering cameras which tracked these operations, and they make for amazing viewing. I used this footage to lay out the operations and explain everything that's happening during this amazingly complex choreographed set of operations that are needed to get the Shuttle off the pad and on its way to space.
Based on Footage from this video produced by NASA
https://www.youtube.com/watch?v=vFwqZ4qAUkE
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