URUK
Thanks for this video vlad9vt, [this is a copy-paste of my comment to the channel's creator on YT), I'll add it and the Eridu one and some of your others to my "Mysteries of the Most Ancient Past" playlist which covers all the new mega-ancient history that's come to light in recent years as this one fits with the rest as underscoring the 5000 BC origins of Uruk and the other Sumerian-culture cities once Dilmun was drowned in 6000 BC by the release of the Laurentian Ice Sheet's meltwater (Lake Agassiz) when the ice dam across Davis Strait from Ungava (Quebec/Labrador) to Greenland suddenly (?) broke... ... sea levels rose by 200m when that happened in 6000 BC... Doggerland was flooded, making Britain and Ireland islands and separating Jutland and Frisia from Britain with the North Sea.... Heligoland was a low mountain in that vast rolling country as were the other islands off Frisia.....what's out there beneath those waters only legends tell... one of them