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Different strokes.

First off, if the water canopy was sufficiently thick to block "harmful gama rays"(sic) outright, and (in conjunction with the "fountains of Tehom" ) provide enough water to put the highest mountains fifteen cubits under, there would be no light.

Once you get under about 1km of water, you reach a phenomenon called the midnight zone; light does not penetrate at all. "Let there be light" would not be visible from the earth for about 1600 years.

The canopy, furthermore, would need to be solid ice, and thick enough to not be melted by raw solar radiation within 1600 years; otherwise frictional heating from the earth's rotation, and the sun's energy, would bring it down much sooner. However, a solid shield of ice above the atmosphere would compress the atmosphere, thickening it to the point where it certainly wouldn't be breathable, and causing explosive decompression at the Diluvial event.

How much? Well, for each 10 meters of thickness, the atmospheric pressure at sea level would increase by one atmosphere. For 4km - a generous division - we're talking 400 atmospheres, or about 5878 psi.

The Flood of the Earth has already been proven true. Flash fossilized trees were found erect in sediments in Texas. This is why the theory that the crust of the Earth iS growing over time was proven untrue. There are flash fossilized remains found all over the world found between several layers of sediment all over the world. It is a Generally excepted theory in the scientific community. How the flood happen is where the disagreements begin. And yes... Taking into account the water from the polar ice caps... There is enough water to flood the Earth.

First off, you're speaking of so-called polystrate fossils. Flood sedimentation is only one cause of these; volcanic activity (such as is KNOWN at Mount St. Helens,) as well as surviving partial burial only to be buried more later also result in such fossils. There are even whole forests that were buried under glacial ice after being trapped by local floods during the Ice Ages; one of these is in Illinois. Those weren't actually fossilised though.

So no, polystrate fossils don't prove the World Wide Flood™.

Second, Florida isn't the Earth, no matter what Jeb Bush thinks; simply melting the ice caps would only bring up the sea level by about 65 meters.

The title is a bit sensationalist: the water is pushed down there by crustal subduction - and it's not an ocean in the proper sense, as whatever water is down there would be bound in the ringwoodite, and plays a role in the mantle's fluid mechanics and the earth's heat transferrence.

It's not free water - and freeing it all in a geologically sudden burst would be a catastrophe well in excess of the earth cosplaying a Kevin Costner movie - one that no boat full of zoo would survive.

This was not one time and rapid change. That would make no sense at all. That's like two wolves giving birth to a Scottish Terrier.