During the sixth dive of the 2023 Shakedown + EXPRESS West Coast Exploration expedition, the team observed several scarps like this one that contained holes with five-centimeter (two-inch) widths that were interpreted to be biological boreholes, as there was no evidence for dissolution or water escaping from the holes.
Scarps
Image courtesy of NOAA Ocean Exploration, 2023 Shakedown + EXPRESS West Coast Exploration. Download larger version (jpg, 1.43 MB).

During the sixth dive of the 2023 Shakedown + EXPRESS West Coast Exploration expedition, the team observed several scarps like this one that contained holes with five-centimeter (two-inch) widths that were interpreted to be biological boreholes, as there was no evidence for dissolution or water escaping from the holes.