But you didn't address whether there's any truth to them, which is the question.
The geologic evidence demonstrates that the world was not completely covered at any time in the last 100 million years, at a minimum.
How much further have they dug?
Every fossil they dig up supports this finding, and the genetic evidence also supports it. The differences between the chimp and human genomes puts our common ancestor at 5-8 million years ago.
3 million years ago we find Australopithecines. No modern humans, and no Homo species whatsoever. It isn't until about 1.5 million years ago that we start seeing early Homo species that still have ape-like features. At about 200,000 we start seeing modern humans. The Neanderthal genome also supports this, showing that our common ancestor existed about 500,000 years ago.
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