This is exactly underground Atlanta. They raised the ground level and built the new city on top of the old. The old storefronts and businesses are still there.

This is exactly underground Atlanta. They raised the ground level and built the new city on top of the old. The old storefronts and businesses are still there. About 1/8th of it is publicly open, but there's a ton more that's closed off and is just trains driving under the city.