Zion

Zion is the last, only known human city on the planet Earth. The city is the launching point for The Resistance against the Machines that threaten their freedom. Zion, a city of over 250,000 humans, is actually a massive series of caverns deep under the ruined planet's surface, close to the planet's core, for warmth, power, and protection. Based on the understanding of the human government living there, the location of Zion is unknown to the Machines, until the Machines found a way into it through the Dock.

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