I heard china has stated that they would use nukes only in response to a nuclear attack upon china, but taking out the 3 Gorges dam seems like it could provoke a radioactive response.
I'm not religious, in fact I don't like religion, but for want of a better word, I "pray" for world peace--But with most countries on earth-even the poorest ones--arming themselves to the teeth, I feel it just aint gonna happen.
Deeper and deeper tunnels may prevent the actual destruction of a facility, but tunnels must have an entrance which when destroyed would effectively entomb the facility.
If a bothersome beehive contained only one 40lb. bee, you could destroy the hive with a sledgehammer. Try that with a hive containing 5,000 1/2 gram bees!! Sometimes it's best to disperse things you wish to protect and hide them in plain sight. Bin Laden probably drives a cab in Washington D.C.