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Level 18 is a teal and pink inside of a nuclear power plant. Around the hallways are doors that may have the toxic sign and may lead to other hallways. You can find fire extinguishers in front of these doors in case a fire starts in this level. The language spoke here is Japanese.
It is not recommended to be in this level for too long as levels of various radioactive elements could rise over the time, going through the doors without a toxic sign is recommended as going through those with a toxic sign will increase your risk of mutation from the levels of radiation.
There are no known colonies or outposts located in Level 18.
Jacob Lee