Tokyo has solved this problem already. Random article I found, perhaps not the best. http://newlaunches.com/archives/a-tour-of-tokyos-alien-like-underground-t

Tokyo has solved this problem already. Random article I found, perhaps not the best. http://newlaunches.com/archives/a-tour-of-tokyos-alien-like-underground-temple-drains.php http://newlaunches.com/archives/a-tour-of-tokyos-alien-like-...