Also the term OOPArts, out of place artifacts such as the one discovered in the Cosa Mountains of California by rock hounds collecting geodes. What was discovered appeared to be an electrical device of vast antiquity.
When sliced in two, the object showed a hexagonal part, a porcelain or ceramic insulator with a central metallic shaft, and the remains of a corroded piece of metal with threads. The overall impression given is that the object in the geode is man made and not a bizarre trick of nature, It appears to be some kind of electrical device, specifically a spark plug.
And so on, findings and discoveries as the ones stated confirm that the pre flood civilizations were very advanced, which is what brought about the judgment of God.