When daylight bombing began in March 1944, the factory workers in Berlin ran to the nearest shelter. The alarm would sound, and then swarms of people would start running from all directions towards the Humboldthain bunker. This was the biggest one in Berlin, five storeys tall, with room for thousands of people. There were anti-aircraft guns on the roof and when they were firing the whole building would shake. To read more: www.elinorflorence.com/blog/berlin-bombing.