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The floor of the summit crater at Nikko volcano has numerous hydrothermal vents that are vigorously venting cloudy water, making visibility challenging. Deposits of sulfur are everywhere and the biomass is extraordinary. Large tubeworm bushes are common, along with a huge number of crabs and flatfish. Video courtesy of Submarine Ring of Fire 2006 Exploration, NOAA Vents Program.

Related Links

Submarine Ring of Fire 2006

Submarine Ring of Fire 2006: May 12 Log

NOAA Ocean Explorer Gallery