Today’s dive with remotely operated vehicle (ROV) Deep Discoverer (D2) focused on engineering testing. After an initial run-through of all of D2 standard capabilities, our ROV team began testing new equipment and tools, like photomosaicking. D2 landed on a flat bench feature with a soft sedimented seafloor along the wall of Lindenkohl Canyon at a depth of 665 meters. Common fauna included squid, red crabs (including a couple mating pairs), siphonophores, jellyfish, euphausiids, and a few different species of fish. After all engineering trials were successfully completed, D2 was recovered from a depth of approximately 660 meters.