No, water in the mantle does not prove the flood.
What is required to prove the flood is evidence
of a massive flood during historic times, i.e., in the past 10,000 years or so. That is lacking.
What we have instead is evidence of continuity
during that time period:
--Continuity of human cultures in all parts of the world
--Continuity of human DNA in all parts of the world, with no break followed by replacement with one narrow DNA strain from the Middle East
--Continuity of stratigraphy, with no evidence of massive flood or erosional deposits
--Continuity of fauna and flora, with no evidence of massive bottlenecks within the last 10,000 or so years.
Just one little piece of evidence from my field (archaeology): A skeleton was found in southern Alaska which dated to 10,300 years. It had a rare mtDNA haplotype, but that same haplotype was found in about 46 living individuals stretching down the coasts of North and South America. This shows that there has been no flood since 10,300 years ago which wiped out all worldwide populations.
But wait, there's more! In the past few months information from a Clovis age skeleton has been released--it dated about 12,600 years old, and had the same rare mtDNA haplotype! Again, no evidence of the massive die-off which must have accompanied the purported flood, but rather a continuity throughout the historic period.
(We'll leave for another time the DNA being sequenced from Neanderthal fossils in Europe and Asia. It shows continuity back some 50,000 years.)
Because of this, and much more evidence of a similar general nature, creationists have had to push the date of their purported flood back to the K-T boundary about 65 million years ago, or even more extreme, to the P-T boundary, some 262 million years ago. This ignores the fact that modern humans are only some 200 thousand years old. But hey! When you're searching around for evidence of a global flood, what are a few mangled facts here and there?
So, the answer is no. To have evidence for a global flood during historic times you must go far beyond just a source of water. You need to have real-world evidence for a global flood!
And that is the one thing that they don't have.
Edited by Adminnemooseus, : Off-topic banner.
Religious belief does not constitute scientific evidence, nor does it convey scientific knowledge.
Belief gets in the way of learning--Robert A. Heinlein
How can I possibly put a new idea into your heads, if I do not first remove your delusions?--Robert A. Heinlein
It's not what we don't know that hurts, it's what we know that ain't so--Will Rogers
If I am entitled to something, someone else is obliged to pay--Jerry Pournelle
If a religion's teachings are true, then it should have nothing to fear from science...--dwise1
"Multiculturalism" does not include the American culture. That is what it is against.