No Pete... "a lot of the water" did NOT "come from below". That is a wild guess trying to account for 'water covering the entire Earth'...which simply did not happen! There was no flood deep enough to cover all the Earth and over the mountain tops!
At some time in the past, there was some sort of local event...**probably** when this happened! There have been searches of the bottom of the Black Sea that found artifacts dating to that era. It was a HUGE event, and with no TV coverage, stories would naturally grow about 'water covering everything'. Maybe someone with a boat actually escaped with his family & some animals, but NO actual writings cover it, as writing barely existed back then.

You cannot just toss in bad science to explain bad theology!