One aspect I never understood was how the City was "protected" by the natural wall. It seems established that the only transportation route into the city is via the "crack" in the wall, and there's even an episode showing that the city's static military defenses are exclusively focused on that one area.
There are no indications that the wall is absurdly high (there are never any clouds or temperature changes at the top), and even if it was, these are planes shown to be able to reach the stratosphere. There are no anti-aircraft guns along the top and no natural defenses (fog, storms, birds) either.
Was it ever explained why the crack was the only way to access Cape Suzette? I hope you can clarify this as it has been bugging me since childhood :) Thank you!
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