During the 2016 Deepwater Exploration of the Marianas, we explored the crater of Daikoku Seamount, observing active venting and thick volcanic smoke, supporting the hypothesis that there had been recent volcanic activity in the area. Plumes of likely carbon dioxide gas and sulfur were emanating from cracks and orifices near the crater rim and along the lower wall of the crater. We saw tubeworms, crabs, and a high density of flatfish specialized in living on the sulfur rich ground.
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Video courtesy of NOAA Ocean Exploration, 2016 Deepwater Exploration of the Marianas.