ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY ALEXIS ROSENFELD / SCIENCE PHOTO LIBRARY
Scuba diver illuminating a wall with a powerful torch. The wall is home to numerous sea fans (or gorgonians, red branching structures). These are coral-like organisms, consisting of a colony of individual polyps that build a tough structure around themselves for protection and support. Photographed off Riou Island, in the French Mediterranean.
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