my brother sent me this and i found it quite interesting...i don't know how many cities have considered this (i imagine in this case it might be built parallely to subway construction)
original (english site)
Secret underground warehouse in Tokyo (video) ::: Pink Tentacle
(spanish one)
Almacenes subterráneos secretos en Tokio Mare Magnum
there is some desertic places that are clamed to be huge shelters in case a major catastrophy occurs in USA.
i remember a NG magazine where they showed a mine used to get rid of hazardous materials underground...but it was getting to it's limit really soon...and that place was really BIG.
check it out and if you have some related material i'd be more than happy to read about...
