Or maybe more likely a storm of comets and other debris that originated from the fountains of the great deep inside the Earth. So massive it even broke open the atmosphere surrounding the Earth [see Genesis 7:11].
Center for Scientific Creation - In the Beginning: Compelling Evidence for Creation and the Flood
http://www.creationscience.com/onlinebook/IntheBeginningTOC.html
Dr. Brown was inspired to formulate his hydroplate theory by Whitcomb and Morris as well as the Bible.
The comet-induced flood was “the fountains of the deep.”
We humans evolved in the abyss that is now covered by more than two miles of water. We were flushed out and are now occupying lands that, prior to the comet, were nearly unoccupied (mostly too cold).
Here’s an interesting perspective that you might consider: humans are an invasive species adapting to this new environment.
Another consequence: it is almost certain that Atlantis existed.