Because they drowned before they had a chance to write about it? And the cultures that came afterward didn't know what happened, except what was written in the Scriptures, or told to them by someone?
AV, I'm sure you are aware of the restrictions placed on scripture back then. Not just anyone could read them; certainly not people from other cultures.
It also does not explain why these flood stories omit Noah (if Noah and his family were the only survivors, why leave them out?), and why some predate the Biblical account.
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