Ok, here goes.
Imagine it all went pear shaped.... WW3 is off and running, with ICBM's dropping all over.
Now, say you live near somewhere with natural underground systems,and you decide to go and start living in the deep caves, (Peak district is my example),and boom, one drops on the city ..
Now, I know that if caught up on top, everyone would be a pile of ashes,but how much protection does folk think you would get from being down in the caves, and would the water seeping through some rocks,(Normally good to drink), become contaminated?
Like I say, purely hyperthetical, I just want to see different peoples views..
Cheers,
Si.