Saw this BBC story on it last year: http://www.bbc.com/future/story/20181129-the-underground-cathedral-protecting-tokyo-from-floods http://www.bbc.com/future/s

Saw this BBC story on it last year: http://www.bbc.com/future/story/20181129-the-underground-cathedral-protecting-tokyo-from-floods http://www.bbc.com/future/story/20181129-the-underground-cat...