The following are some points I made recently on a Creationwiki topic of this exact name (my own writing/sourcing):
Biblical flood - CreationWiki, the encyclopedia of creation science
"Recent discoveries have revealed that the inner earth may hold more water than the seas. Analysis of the earth's likely composition in 2002 revealed "there may be more H2O deep underground than in all oceans, lakes, and rivers combined."[9] In 2007, scientists discovered for the first time that a vast 'ocean' exists beneath Asia that is at least the volume of the Arctic Ocean.[10] According to National Geographic, the water appears locked in moisture-containing rocks discovered through scanning seismic waves[11], but further discoveries could follow.[12]"
[9] Harder, Ben (2002, March 7). "Inner Earth May Hold More Water than the Seas." National Geographic.
http://news.nationalgeographic.com/...7_0307_waterworld.html
[10] Than, Ker (2007, February 28). "Huge 'Ocean' Discovered Inside Earth." LiveScience.
Huge 'Ocean' Discovered Inside Earth | Live Science
[11] Lovett, Richard A. (2007, February 7). "Huge Underground 'Ocean' Found Beneath Asia." National Geographic.
http://news.nationalgeographic.com/...070227-ocean-asia.html
[12] Harder, Ben (2010, November 8). "Earth Contains a Vast Amount of Water, But Scientists Are Unsure of Its Origins." Washington Post.
http://www.washingtonpost.com/.../11/08/AR2010110804478.html
Bryner, Jeanna (2007, October 1). "Huge Stores of Oxygen Found Deep Inside Earth." LiveScience.
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Krulwich, Robert (2011, June 23). "How Much Water Is There On Earth? Magellan Would Be Shocked." NPR.
How Much Water Is There On Earth? Magellan Would Be Shocked : Krulwich Wonders... : NPR
Edited by Jzyehoshua, : No reason given.