Not at all nifty, because it is etymologically incorrect and based off fictional personages recorded in a mythic account plagirized by the superior Sumerian.
The polar icecaps have much volcanic ash, the volcanos were rocking during the Ice Age, much isostatic adjustment to the overburden of the then growing Ice Age icepacks, and readjustment when they melted.
Tree rings do reflect periods of more and less growth, not years.
Seek, and ye shall find, prince, try googling: submerged/underwater megaliths Gibraltar, Spain, Lixus, Morocco, Malta, Greece, Egypt, Yarmuta, Sidon, Lebanon, Okinawa, Yonaguni, Ryuku Islands, Dwarka, Kumari Kandam, Mahabalipuram, Gulf of Cambay, and Gulf of Cambay.
And Visitor, Thule Land was the Atlantean coastal empire of the east Atlantic which went under circa 1500 B.C., when the Ice Age ended.