Deep sea coral. Beautiful purple octocoral. Probably Anthothelia grandiflora.
In this image the polyps are retracted. See image expl9114 to see a colony of
this type of coral with both an area of extended polyps and retracted polyps for
Image ID: expl9121, Voyage To Inner Space - Exploring the Seas With NOAA Collect Location: Block Canyon 1134-995m Photo Date: 20130723T182748Z Credit: NOAA OKEANOS Explorer Program , 2013 Northeast U. S. Canyons Expedition