It was supposed to be.

[It was supposed to be the greatest city in the world.]

You know if the city lasted longer, I am sure we would have ended up with a similar fate. We were brought down when it was built but going up to the surface was forbidden. Material from the surface was forbidden. They were just starting to punish more things with death when the civil war started.

I can only imagine that if such ways had continued, the surface would be viewed the same as the world outside your walls.