Presenter Neil Oliver visited the sands of Aberdyfi and Ynyslas, near Borth, and examined the remains of the submerged forest and Sarn Badrig which are revealed at low tide, assisted by local historians and dendrochronologists.
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Lewis takes the view that maps by the cartographer Ptolemy marked the coastline of Cardigan Bay in the same location as it appears in modern times, suggesting that the date of the flood occurred before the second century AD.
It is named after the Russian rocket scientist Vladimir Chelomey, the Director of the Research Cantre for space projects, located in Reutov, east of Moscow, Russia.