What do places like New York City/etc. do when Subway tunnels flood due to torrential rain? Where does the water go?

Question

With Henri hitting the northeast, I was thinking about that and how when Elsa hit that the subway tunnels flooded. Do they pump it out or something?

In: Engineering

Answer 1

There is a book titled, The World Without Us, that goes into the inner workings of this pretty descriptively. Worth a read