Preparing for war? Posters are put up in #Beijing to teach people how to quickly get into underground air defense facilities after alarms go off. In the 1960s, lots of civil air defense networks were built in large cities, when #CCP prepared to go to war with Soviet Union and US pic.twitter.com/vn0eljVS5S
— Jennifer Zeng 曾錚 (@jenniferatntd) July 25, 2020
h/t Builder