Chattanooga was too. I have a feeling this was pretty common in response to river flooding and implementing sewage lines. https://en.wikipedia.org/wiki/Undergr

Chattanooga was too. I have a feeling this was pretty common in response to river flooding and implementing sewage lines. https://en.wikipedia.org/wiki/Underground_Chattanooga https://en.wikipedia.org/wiki/Underground_Chattanooga Although in Chattanooga, I don't think any buildings there were raised. I think they just covered up their first floors. If you work in a building with an underground connector to another build, you'll still see old bricked up door frames to where the streets use to be and halves of windows on the floor.