Modern secular science is purely made-up stuff to explain that which people can't otherwise understand. So because secular science couldn't understand where all the water went, they said that the great flood never happened. And they call that science!
Now that we know all the water is stored underground, that theory of theirs falls apart. All we need now is few more things like that to happen, and the scientists will have to close up shop and go home, admitting that everything in the Bible is in fact, true!