Obviously ... Jerry, the signs of human settlement were washed away in the massive tidal waves. The YouTube video acknowledges that the site is elevated, rather than submerged, so perhaps this may have been a satellite site to Atlantis? If such as Atlantis really sank, then other areas can rise.
There is a site just north of Cadiz, Spain with concentric rings that seems like it might be the same, also with geographic proximity to ancient metal mining.