I think there is good evidence that there was a massive flood at one time that wiped out many nations. Skeptics have conceded that a huge flood did strike the Mesopotamian region and attribute the stories about the Flood to the Sumerians, Akkadians, Babylonians, etc.
If there was a worldwide flood that was observed by many different nations, then that would seem to refute the Genesis account -- for the Genesis account only allows 8 surviving observers.
I think it more likely that the flood tale is a great story, so many cultures take it and adapt it to their own experiences when they first hear the tale.
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