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ROV Seirios
Seirios follows D2 into the water for their next adventure. Much like his namesake, Seirios acts as a brilliant source of light in the "night sky" of the ocean, providing illumination and a wide-angle view from above for its counterpart ROV, D2.
Credit

Image courtesy of NOAA Ocean Exploration, Exploring Deep-sea Habitats off Puerto Rico and the U.S. Virgin Islands.