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

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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

Subway tunnels indeed have pumps to remove excess water. If the flooding is too great, certain lines may have to be shut down temporarily.

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

It is pumped out from the lowest points, floods happen when the amount of water coming in exceeds the capacity of the pumps.

I was in New York when the steam vents exploded near Grand Central station, because a flash flood got into the vents.