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Crinoids
Video courtesy of the NOAA Office of Ocean Exploration and Research, 2015 Hohonu Moana. Download (mp4, 12.7 MB)

While we may often think of crinoids as animals firmly attached to the seafloor, they are in fact free-swimming animals. This footage was captured during the tenth dive of the expedition, on August 11, 2015, on a ridge that extends to the southeast of Salmon Bank.