You may find this interesting. Neil B a really strange guy who converted to Judaism, became a Muslim and then a Hindu he was a more complicated person than me.
Anyway he once told me 75% of the Chinese population can go underground in case of a nuclear attack. I never believed him for years until I found out about it a couple years ago. I must have walked past the entrance 100 times in the many visits to Beijing I make and never noticed it.
There is one in Shanghai too as well as Chongqing and who knows how many more...
Hey does anybody remember the fallout game series?