This item is a result of an AI-based algorithm, which may not always be correct. Below it's the reasoning behind the AI's decision.
You can tell it what it did wrong and how it should be done instead.
Make a city map. It would have a sinkhole in the middle, with caves branching off to go accross the city. The sinkhole would have the red element in it (for lore reasons), and there would be no air vehicles.