" Another extraordinary similarity concerns the presence of Seven Sages in both the Sumerian and Vedic traditions. Most ancient societies, I concede, had their sages or seers or wise men -- in India they were, and still are, called rishis. But it seems to me to be stretching coincidence too far to find a group specifically named the 'Seven Sages' prominently associated with two separate ancient cultures and to imagine that this did not come about through some sort of connection.
In the case of Sumer the Seven Sages were depicted as amphibian, 'fish-garbed' beings who emerged from the sea in antediluvian times to teach wisdom to mankind.
In the case of the Vedas the focus is not on the antediluvian period but on the flood itself and those antediluvians who are claimed to have survived it, namely Manu and the Seven Sages. "

― Graham Hancock , Underworld: The Mysterious Origins of Civilization