" If we accept the generally agreed date of between AD 350 and 550 for the end of the -- at least semi-historical -- 'Third Sangam', then this gives us a fixed reference point on which to anchor the chronology of the myth [...]. The date of 9600 BC for the formation of the First Sangam (or 9800 BC or 9400 BC for that matter) coincides closely enough with Plato's date for the inundation of Atlantis -- also 9600 BC -- to raise the hairs on the back of my neck.
And the question continues to be this: how could Plato less than 2500 years ago, or Nakirar less than 1500 years ago, have managed by chance to select the epoch of 9600 BC in which to set, on the one hand, the sinking under the waves of the Atlantic Ocean of the great antediluvian civilization of Atlantis and, on the other, the foundation of the First Sangam in Kumari Kandam -- a doomed Indian Ocean landmass that was itself destined to be swallowed by the sea?
If Plato and Nakirar were pure 'fabulists' working independently of any real tradition or real events, then isn't it much more likely that they would have chosen different imaginary epochs in which to set their flood stories?
Why didn't they choose 20,000 or 30,000 years ago -- or even 300,000 years ago, or three million years ago -- instead of the tenth millennium BC?
And was it just luck that this slot turns out to have been in the midst of the meltdown of the last Ice Age -- the only episode of truly global flooding to have hit the earth in the last 125,000 years? "

― Graham Hancock , Underworld: The Mysterious Origins of Civilization