The City Maintenance Tunnels houses important infrastructure and machinery to keep the city above running. Cooling systems, boilers, electricity are all regulated through here. There is always a crew present around the clock to ensure all systems are operational. Would be a disaster if anything were to happen to these mechanisms and cause chaos in the city...

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A tunnel map where you explore the underground network of tunnels below a city, originally planned to make it a sewer but thought this would be interesting as well. Perhaps it could also be used as some kind of power generation facility that your players must defend or attack.
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