In a cold-seep community a third of a mile down in the Gulf of Mexico, the orange mat in the foreground is a colony of microbes that live on oil and gas seeping up from the seabed, starting a complex food chain that results in a dark ecosystem. In the background are tubeworms, which can grow eight feet long and live for centuries. Near the tubeworms are snail and clam shells, which appear to be empty.
http://www.nytimes.com/slideshow/2010/06/22/science/20100622cold.html
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