There is considerable evidence that the story of a Great Flood is repeated in many cultures.
I do have a question though and that is where did all that water come from?
I’m not an expert, but here are a few thoughts. The second chapter of Genesis notes that no rain had as yet fallen on the earth, but a “mist,” used to rise and water the entire surface of the land.
At the conclusion of the Flood, it’s noted in Genesis 8 that both the “fountains of the deep,” and the “floodgates of the sky,” were “closed.” Iow, rain didn’t account for all the water. There was a geological cataclysm that included the bursting open of the “fountains of the deep.”
Additionally, some have interpreted the earlier allusion to mist as meaning it didn’t rain at all until the flood. Rather, a heavy cloud cover created a year-round tropical environment.
These are just some hopefully useful thoughts. I’m not a Flood aficionado. Maybe someone who knows more about it can give more specifics.
Mostly subterranean. Lot of it still down there. It's not free liquid at those temperatures and pressures, of course.
Presents the theory that a planet sized object passed Earth at just the right distance ( The Roche Limit) to cause a massive tidal effect on Earth.
We already know that during the last ice age, sea levels were hundreds of feet lower then they are now. For the most part the rise was slow but there were a few dramatic rises that would have affected costal communities worldwide. For instance the black sea flood and the several north American glacial lake dam burst.
There are even underwater cities in crete, India, and elsewhere to attest to that...bet they have some flood stories.