Improbable though it may sound, from late 1944 through the spring of 1945, the Japanese launched more than 9,000 balloons from their nation's eastern shores...One balloon, for example, managed to cut through power lines leading from the Bonneville Dam on the Columbia River. A resulting power outage that was quickly restored may sound insignificant; however, that particular dam provided power to a factory in Hanford, Wash., which was secretly manufacturing plutonium for use in the atomic bombs destined for Japan.
Though I dislike censorship, I think the evidence supported it in 1945.
