I;ve always given credence to the idea that the breach of the bosporus at the end of the last ice age (possibly in reaction to the collapse of the land bridge connecting britain and france) and the subsequent inrushing of water into the Black Sea basin was a pretty good basis for the origins of the biblical flood story, that has so many resonances around the mythologies of the ancient world. For better or worse, the Bible does attempt to be a history of the world, and over the tellings of millenia, details will have changed, but the physical evidence for massive movements of water courses when the ice age ended are really strong.
Scientists Discover Massive Freshwater Reserves Underneath The Ocean Floor