From circa 23000-9600 BCE [cal] the Black Sea was an inland lake
with minimal fluvial imput.Water levels were about 115m below todays height.After a 7 degree C temperature rise over 10 years at the end of the Younger Dryas [ca 9600 BCE],glacial melt from the north began to Cascade into the Black Sea.Tectonic activity,which was induced by glacial rebound,"might" have opened the conduit for the southward flow.Where glacial melt is rafted down rivers,people have a better chance to survive than those proximal to a breeched
glacial lake.The Danube River also flowed into the Black Sea and made a significant contribution.The above is compatible with the A Asku [2002] geophysical report.
Corrected radio carbon beach shell dates [P Dimistrov,1993] infer a water depth less than 100m below extant levels early in the ninth millennium BCE.Although there were minor regressions prior to 6200
BCE,there was an appreciable rise in the height of the water.
Whether it was sufficient to flow into the Marmara Sea,is a moat point.There was a regression during the 6200-5800 BCE cold era,
when inflow to the water body was sharply reduced.
Ryan and Pittman [2000] collected marine shells in Black Sea water depths of 68-123m,that date to the cold era-a lacustrine low stand.
Water from the Marmara Sea subsequently flowed into the Black Sea via the Bospherous and/or the Sakorka conduit,There is no diagnostic evidence in the geophysical or geological data,which has been accumulated since 2000,that this was a catastrophic event.Catastrophic or not,it would have impacted on the people,who resided by the waters edge.