The Ruad Wall: Evidence For A Pre-Flood Civilization
An argument that truly distinguishes these structures as far more ancient than they lead us to believe. And that argument is simply, why didn't we continue to build this way. The wall formerly surrounded the whole island, the biggest stones measure 3 by 5 meters.
What needs to be explored is what is concealed by the sea. I believe diving to about 100-foot depth. Move down over descending land beneath the sea to much older shorelines. They're finding cities under three feet of water.