Moreover, one would destroy less than 300 meters of a tunnel using three warheads. 500-kiloton warheads in order to make sure the tunnel network is completely destroyed. This is the VERY unlikely case in which you know the exact layout of the entire tunnel network. AND this is just one of several missile sites in China. China has been digging underground tunnels in the mountains since the mid-1960s.
China happens to have many huge mountain ranges everywhere.
So there are other underground tunnel networks for the strategic missile force in the central and southern China's mountain ranges. Sorry for using anon-service. But I don't want my boss to know I'm wasting his time. Thanks for your understanding. The estimated length of the underground tunnels about 1,000 metesr deep is 2,000 km.