Interesting

From scripture:

"In the six hundredth year of Noah’s life, in the second month, on the seventeenth day of the month, on that day all the fountains of the great deep burst forth, and the windows of the heavens were opened. And rain fell upon the earth forty days and forty nights."

Personally, I find it persuasive that the 'fountains of the great deep' included massive volcanic activity -- that more than water was at work during the disaster in which "the world that then existed... perished."

But then there's this interesting little news item:

Scientists scanning the deep interior of Earth have found evidence of a vast water reservoir beneath eastern Asia that is at least the volume of the Arctic Ocean....
Previous predictions calculated that if a cold slab of the ocean floor were to sink thousands of miles into the Earth's mantle, the hot temperatures would cause water stored inside the rock to evaporate out...
Although they appear solid, the composition of some ocean floor rocks is up to 15 percent water. "The water molecules are actually stuck in the mineral structure of the rock," Wysession explained. "As you heat this up, it eventually dehydrates. It's like taking clay and firing it to get all the water out."

Fountains of the great deep, indeed.  Whether the disaster of Noah's day involved volcanoes or merely gathering all the water in and on the planet to cover the surface is less important, though, than the fact it happened... and what that portends.  Just as it was in Noah's day, it's a call to repentance.