RT @hbdchick
the chicago river once sprung a leak and 250M gallons of water flooded downtown basements via a disused tunnel system under the city. the roof of one of the tunnels running UNDER the river was pierced when workmen were driving piles into the riverbed. https://en.m.wikipedia.org/wiki/Chicago_flood https://twitter.com/ericmgarcia/status/1460747017706168321