Small conical mounds with holes in the top, probably some sort of animal burrow.
The right-most mound is reminiscent of a bee-hive.
Image ID: expl6021, Voyage To Inner Space - Exploring the Seas With NOAA Collect
Photo Date: 2010 August 1
Credit: NOAA Okeanos Explorer Program, INDEX-SATAL 2010
• High Resolution Photo Available
of the U.S. Department of Commerce, National Oceanic & Atmospheric
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November 10, 2017