Theres was nobody left to have memories and write an account...
They were all drownws...
Only Noah and Mrs Noah and their 3 sons and their wives were saved in the Ark...
And please explain in a period of a few thousand years,we have all the races of the world,The black Africans to the yellow asians and all those in between, all decedents from just Noah. Maybe you should take a more realistic view as to how that might have happened because there is no explanation in the bible as to how that occurred.
and from the three sons (and Noah) came the new nations.
English and other Europeans languages came from a predecessor now called ‘India-European’ (after aryan became to tainted)
Sumerian is one of those languages.
Supposedly originated north of the Caucus and Black Sea.
From the sons of Japeth. Then grew out west to Iran, Greene, Rome, France, Germany, and England.
Assume the rest of the sons developed out in the other directions.
http://new-indology.blogspot.com/2015/05/sumerian-and-indo-european-surprising.html?m=1