I'm missing my 667 fix

I saw something on TV a while ago about stormwater storage tunnels quite deep under London, They were talking about using the same machinery as the Chunnel (That would be an interesting location for EU Survivors). What about the London Tube? would it be far enough below ground?
The White House is rumoured to have a Nuclear powered bomb shelter,
Here is some video on the Greenbriar Hotel Bunker
http://www.youtube.com/watch?v=b6c1zoT99-4How about British and Russian Nuclear Subs
Not forgeting ICBM silos and other cold war treasures
http://www.missilebases.com/Speaking of Nuclear, How would the worlds Atomic power stations fare?
I suppose any large tunnel could make a fair shelter, Sydney Harbour Tunnel is 960 metres/yards long (subnerged section) with a 900 metre land tunnel on one end, and a 400 metre (quarter Mile) one on the other end..
How about the Mont Blanc Tunnel between Italy and France, It is over 7 miles long... though only two lanes wide... Not sure if being 4000ft above sea level would make water aquisition dificult...