http://earthobservatory.nasa.gov/Newsroom/NasaNews
/2001/200112106303.html
http://oceanexplorer.noaa.gov/explorations/deepeast01/
background/beneath/beneath.html
http://soundwaves.usgs.gov/2003/06/outreach2.html
http://www7430.nrlssc.navy.mil/7432/hydrates/background.htm
http://www.geol.msu.ru/deps/cryology/index_h_en.htm
http://web-japan.org/nipponia/nipponia28/en/feature/feature10.html
http://www.bermuda-triangle.org/html/methane_hydrates.html
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