'The Flood', IMO, was the ice melt at the end of the last Ice Age. Everyone, everywhere had a 'flood.'
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Absolute nonsense!
We had one ice age that began 4500 years ago +/-
The flood was the result of the massive rupturing of the crust, which began the formation of individual continents.
It was judgement time. (as the fossilized sea shells at the summit of Mt. Everest tell us)