It would be rather more relevant if they insisted that the tops of all the buildings, even the skyscrapers, were flooded. Genesis 7:19.
Yeah. I didn't expect you'd have the guts to try it, nor the imagination to envision how a even a couple generations of an oral tradition that
everything was covered by water would come to be told as
everything was covered by water,
everything.
Wide eyed "Even the mountains, Grandpa?"
"Everything!"...