This was absolutely fascinating. It reminds me of Tokyo's underground sewage system--considered the largest in the world: http://surfwithberserk.com/the-larges

This was absolutely fascinating. It reminds me of Tokyo's underground sewage system--considered the largest in the world: http://surfwithberserk.com/the-largest-sewage-system http://surfwithberserk.com/the-largest-sewage-system