James,
Since there seems to be big interest in the nuclear electromagnetic pulse (EMP) effect, SurvivalBlog readers might want to see some footage about the Starfish Prime test, [a part of Operation Dominic, a series of tests intended to test nuclear weapons effects in space], which knocked out some power substations on Oahu, Hawaii, around 800 miles away back in 1962. Video clip 1. Video clip 2. – David in Israel
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