The city found underneath Grand Canyon in caves housing giant skeletons and Ancient Egyptian statues and sarcophaguses.my theory; The earth was much more land until the Great Flood of Noah’s day and God left the parts covered with water that had become most evil. Pangea us a term I have heard. I have also watched a documentary where the lead archaeologist who is a Christian believes Atlantis and Tarshish are one and the same and that he found it under a bay that has been covered in two ft of mud on a small island of Crete. He even used satellite sonar and descriptions detailing both to match and his team found many ancient artifacts on the surface. They cam’t sig until they find a safe way as under the mud is a massive picket of methane which could kill many for miles. My solution; evacuate everyone a safe distance, then shoot a missile to somewhere that’d release the methane without damaging anything.