Re:An underground cathedral protecting Tokyo from floods
by kweks on Saturday December 01, 2018 @01:46AM
(#18575597)
There's a few things similar in Paris as well.
Most dense cities with little natural run off have them.
http://ninjito.com/2009-07-19
Reminds me of the cisterns underneath Istanbul (Constantinopolis), built by the romans.
https://en.m.wikipedia.org/wiki/Basilica_Cistern