*The city is filled **The city is filled with inventer who make almost even thing Since they can't tell if it's dark or not up in the upper level they made a alarm that makes a loud bird sound when it's morning so the hole underground city can hear and when it's dark the alarm makes a owl noise, the under city is filled with rivers that are roads instead of a normal road they go where they want with boats and rivers or just invent flying robots, they take the moon set train to the upper level*