These were all port cities of the European Bronze Age and were sunk in 1159 BC by the same events that ended the whole Atlantean sea trade based civilization. I have been posting now for years that the annual copper fleet from all of he Americas but principally from Poverty point and Lake Superior would gather here before making their run to the Irish Sea and Lewis in particular. This area could hardly be more important. It also collected brass from the mines in nearby Georgia.
Pyramids are built world wide and they are mostly associated with the Bronze Age from 2500 BC through 1159 BC. This also had a long more local prehistory.
Earlier pyramids appear also but they are associated with a civilization that predated the 12900 BC destruction of the Great Ice Age through a comet strike causing the Pleistocene nonconformity.
Mysterious ‘Pyramids’ Are Spotted on the Atlantic Ocean Floor