Taste of Spark

There were 10 underground cities in total, each simply numbered and not named. Each one of those cities was of similar height and width, having an average of 60 stories to each city. 

Each story had a circumference of over 2 kilometers, making space for hundreds of houses in each story. With so many stories, that made for tens of thousands of houses in each city. 

And that was only the walls of the city. The main middle section of the city also housed a lot of people as well as the main commercial section of the city.

Even so, with 10 underground cities, the cities were still overpopulated, and building a new city was in progress at the very moment.

Each city was connected to a central hub city, which was where the military operated from. There were dozens of tunnels that led to the 10 different cities all around from this hub city.

It was also the city where Ning had arrived upon.