Nature: National Science Foundation's Sea Vent Viewer

NSF's Earth & Environmental Science site enables visitors to explore interactively the area of the ocean floor in and around a sea vent. The water emerges from the vents at close to 756 degrees Fahrenheit and under enormous pressure from the weight of as much as 1.5 miles of water above, looks and acts like smoke, and supports a rich ecosystem that includes fish, shrimp, tubeworms, mussels, crabs, and clams.
<http://www.nsf.gov/news/overviews/earth-environ/interactive.jsp>