Interesting to know there is a City underneath Chattanooga, Tennessee.
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Underground Chattanooga is a below-ground area of Chattanooga, Tennessee that resulted from citizen efforts to prevent floods in the aftermath of the flood of 1867. It was rediscovered by Jeff Brown in the 1970s.[1]
https://en.m.wikipedia.org/wiki/Underground_Chattanooga
https://en.m.wikipedia.org/wiki/Underground_Chattanooga
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