These are not normal basement rooms. Builders in China are required by law to build these bunkers that can withstand air strikes. E.g. http://www.sz.gov.cn/yjz

These are not normal basement rooms. Builders in China are required by law to build these bunkers that can withstand air strikes. E.g. http://www.sz.gov.cn/yjzhzx/ywgz_54281/rmfk/201711/t20171121_9904486.htm http://www.sz.gov.cn/yjzhzx/ywgz_54281/rmfk/201711/t20171121... Those bunkers are actually owned by the government. Using those bunkers for other purposes are against the law. https://baike.baidu.com/item/%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%B0%91%E5%85%B1%E5%92%8C%E5%9B%BD%E4%BA%BA%E6%B0%91%E9%98%B2%E7%A9%BA%E6%B3%95/1226515?fromtitle=%E3%80%8A%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%B0%91%E5%85%B1%E5%92%8C%E5%9B%BD%E4%BA%BA%E6%B0%91%E9%98%B2%E7%A9%BA%E6%B3%95%E3%80%8B&fromid=11178372 https://baike.baidu.com/item/%E4%B8%AD%E5%8D%8E%E4%BA%BA%E6%... You can even find the build code for those bunkers with keyword GB50038 (Code for design of civil air defence basement)