Video surveys were conducted in July 2016 aboard CCGS Amundsen, using a Super Mohawk remotely operated vehicle (ROV) at Hatton Basin, Labrador (Canada). ROV dives occurred at two nearby sites (~28 km apart) in the Hatton Basin area (Dives 50 and 51). The benthic environment was video-recorded and photographed using a high-definition camera (1Cam Alpha, Sub C Imaging, 24.1 megapixels) mounted on the ROV, at depths ranging between 556-633 m. ROV transects were conducted to collect video data, and samples of corals and sponges were also collected during dive 51. Box-cores were deployed at the two sites. Sea water was collected at several depth intervals from surface to near-bottom to characterize particulate organic matter and to determine calcium carbonate saturation.

A video-survey using a Super Mohawk remotely operated vehicle (ROV) was conducted in July 2016 at South East Baffin Shelf (Labrador, Canada). The benthic environment was video-recorded and photographed using a high-definition camera (1Cam Alpha, Sub C Imaging, 24.1 megapixels) mounted on the ROV, at depths ranging between 492-500 m. The ROV dive was shortened early in the dive due to technical problems. Box-cores and an Agassiz trawl were deployed after the ROV dives. Sea water was collected at several depth intervals from surface to near-bottom to determine calcium carbonate saturation.

A video-survey (Dive 52) using a Super Mohawk remotely operated vehicle (ROV) was conducted in July 2016 at Saglek Bank (Labrador, Canada). The benthic environment was video-recorded and photographed using a high-definition camera (1Cam Alpha, Sub C Imaging, 24.1 megapixels) mounted on the ROV, surveying depths ranging between 363-473 m. At this site, a video transect was prioritized over sampling, but 1 coral sample and 2 sponges were collected. At this location, three box-cores were deployed at two nearby sites, from which only a small sample was retained. Sea water was collected at several depth intervals from surface to near-bottom to determine calcium carbonate saturation.