The Undercity lay under Mega-City One. It was polluted, run-down and decaying and so was created by concreting over the old city and building the new city above[1].
It was home to half-humans, mutants, escaped criminals and other outcasts from Mega-City One[1].
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After Chaos Day the number of inhabitants quadrupled in one day, a state which continued until there were thousands of people in the Undercity[3].
