Yup a right mouthful but imagine a bunker under a city using green energy to grow food, totally prepperish ![Smile :) :)](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
http://www.dailymail.co.uk/news/art...t-tube-tunnels-world-s-subterranean-farm.html
http://www.dailymail.co.uk/news/art...t-tube-tunnels-world-s-subterranean-farm.html