Hydrothermal Vents (aka Black Smokers)

http://www.ocean.udel.edu/deepsea/

http://www.amnh.org/nationalcenter/expeditions/
blacksmokers/black_smokers.html

http://www.pbs.org/wgbh/nova/abyss/life/
extremes.html

Gulf Hypoxia (aka The Dead Zone)

http://www.amrivers.org/mississippiriver/
deadzone.htm

Black Water

http://www.cnn.com/2002/TECH/science/
04/02/black.water/

http://www.cnn.com/2002/TECH/science/
03/27/black.blob/

http://earthobservatory.nasa.gov/Newsroom/
NewImages/images.php3?img_id=8259

http://www.floridamarine.org/features/
view_article.asp?id=15348

2002 Secchi Dip-In

http://dipin.kent.edu/