The air raid on Berlin was complete even to bombs that failed to explode All the thoroughness for which Germans are renowned was brought to bear on the mock air attack on Berlin, the most realistic event ever staged. Not only did thick black smoke rise from buildings supposed to have been hit, but craters appeared in the streets and even bombs which had failed to explode protruded from the ground in main streets. A policeman placing a notice announcing "Live bomb, danger" beside a "dud" buried in a Berlin pavement. 21st March 1935