And you thought Tokyo was fantastic on the surface! Just have a look at what’s under your feet: miles of cathedral-like sewers. A neo-gothic labyrinth of engineering wonder! I just wonder if they ever fill all the way up!

I was absolutely wrong about these! This is Kasukabe and a storm drain at that. Still an awesome space though. Here is a press release:

SAITAMA (Kyodo) An underground tunnel built to take in river
water overflow and release it into another river to mitigate flood
damage was shown to the media Monday in Kasukabe, Saitama Prefecture.