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I think it depends on how close you need to be after the rocket surgery. 3 miles was safe for a shuttle booster. Below ground level with 3ft thick building if you needed to be closer.
Do they mention how they go sonic in such a small space with such teensie equipment? Betcha they didn't even mention the sonic boom wave.
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casual notes from the underground:There are some "experts" out there that in reality don't have a clue as to what they are doing.
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