Underground city background water architecture illuminated. AI generated Image by rawpixel. https://www.rawpixel.com/image/12636574/photo-image-background-space-waterView licenseRail tracks within 1,500 feet of underground passages at the Beckley Exhibition Coal Mine. Original image from Carol M.… https://www.rawpixel.com/image/434371/free-photo-image-mine-miner-west-virginiaFree Image from public domain license