This is what happens to all the rats when cities flood
https://edition.cnn.com/2021/09/19/world/rat-survival-floods-hurricane-scn/index.html
When I visited an underground subway station in New York, I found a caution to be aware of rodents. So, I guess there are so many rodents as to annoy people in the station. The station was comparatively dirty. It would be necessary to keep it clean in order to prevent rodents from flourishing.
