Mysterious ‘Hum' ...mmm...

Back in the 1990s, there was the Taos hum that was making news. Consider that EU is also attempting to sustain itself with underground tunnel boring machines...
http://www.vinesbranch.com/index.php?supermode=gallery_view&previewm=1&a=Unde...

And, its best to know that the governments are going to keep such projects secret because their plans of sustainability don't include you.

http://www.google.com/search?hl=en&sugexp=ldymls&pq=+underground+tunnels&xhr=...