Read this not the article. To expand, Heavy metals. Layers of unnatural heavy metals would have been deposited by moving waters. Where to drill? Known old river deltas, long since dried up and forgotten. Garbage deposits. They would give credence to an extinct, advanced civilization. I have my doubts about a long forgotten civilization having been advanced enough to have been classified as an industrial civilization. There's simply no evidence of there having been one. Artic ice drills would have picked up an uptick in their specific pollutants on the way down with a gap between now and then. While I do believe that our real history is being kept from us, I believe we are more advanced then any White civilization has ever been before. We are heading forward to the point where a worldwide extinction level event with just a few thousand survivors couldn't stop us Whites from coming back to our current technological levels.