For a distance of about 100 meters during our dive at Jarvis Island, as far as remotely operated vehicle Deep Discoverer's light pool reached, the bottom was covered in primnoid corals and sea urchins.
Sea Urchins
Image courtesy of the NOAA Office of Ocean Exploration and Research, Mountains in the Deep: Exploring the Central Pacific Basin. Download larger version (jpg, 1.6 MB).

For a distance of about 100 meters during our dive at Jarvis Island, as far as remotely operated vehicle Deep Discoverer's light pool reached, the bottom was covered in primnoid corals and sea urchins.

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