A corallimorph sea anemone growing in a clam bed at Southern Hydrate Ridge in 2019. Photo credit: UW/NSF-OOI/WHOI, Dive J2-1172, V19

Pom-pom anemone, pink sea urchins, and brittle stars on the seafloor at the Oregon Offshore site (600m depth). Credit: UW/NSF-OOI/WHOI, Dive J2-1170, V19

Pom-pom anemone, pink sea urchin, and brittle stars on the seafloor at the Oregon Offshore site (600m depth). Credit: UW/NSF-OOI/WHOI, Dive J2-1170, V19

A wolf eel swimming past the Jason undervator at the Oregon Shelf (80 m) site in 2019. Credit: UW/NSF-OOI/WHOI, Dive J2-1162, V19

A sea cucumber (likely Paelopatides sp.) next to some cables at Slope Base. Credit: UW/NSF-OOI/WHOI, Dive J2-1160, V19

A pudgy cusk eel (Spectrunculus grandis) swimming by one of the OOI cables at Slope Base (2900 meters) in 2019. Credit: UW/NSF-OOI/WHOI, Dive J2-1159, V19

Close-up shot of a pudgy cusk eel (Spectrunculus grandis) at Slope Base (2900 meters) in 2019. Credit: UW/NSF-OOI/WHOI, Dive J2-1159, V19

Close-up of a deep-sea slime star (Hymenaster sp.) at 2900 meters depth, off the coast of Oregon. Photo credit: UW/NSF-OOI/WHOI, Dive J2-1182, Dive J2-1182, V19

A Mola mola (or Ocean Sunfish) sunning itself at the surface at the Oregon Offshore site. Credit: M. Vardaro, University of Washington, V21

A Mola mola (or Ocean Sunfish) drifting past the Thompson at the Oregon Offshore site. Credit: M. Vardaro, University of Washington, V21

Larvaceans filter feed using these mucus houses, which are frequently seen in the water column during ROV dives. Credit: UW/NSF-OOI/CSSF, Dive R1755, V14

A discarded larvacean mucus house, seen in the water column above Southern Hydrate Ridge. Credit: UW/NSF-OOI/CSSF, Dive R1754, V14

A rockfish and sea star rest among a bed of clams at Southern Hydrate Ridge. Credit: UW/NSF-OOI/CSSF; V15.

A blue shark swims past a school of fish near the surface at Southern Hydrate Ridge. Credit: NSF-OOI/UW/CSSF, Dive R2260, V22

Unidentified squid seen during the ROV ascent from the seafloor at Southern Hydrate Ridge. Photo credit: NSF-OOI/UW/CSSF, Dive R2260, V22

Looking down on a galatheid crab sitting on the rope attached to a marker next to the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water. A number of venus flytrap anemones are also attached to the hard surfaces here. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A galatheid crab (aka squat lobster) sitting on the rope attached to a marker next to the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water. A number of venus flytrap anemones are also attached to the hard surfaces here. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A unique community of invertebrates gathered around the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water, including a Bathydoris nudibranch, flytrap anemones, galatheid crabs, and sea cucumbers. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A unique community of invertebrates gathered around the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water, including a Bathydoris nudibranch, flytrap anemones, galatheid crabs, and sea cucumbers. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A unique community of invertebrates gathered around the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water, including a Bathydoris nudibranch, flytrap anemones, galatheid crabs, and sea cucumbers. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A startled squid (likely Octopoteuthis deletron) releasing ink during the descent towards the Slope Base Shallow Profiler anchor. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A deep-sea octopus (possibly Muusoctopus?) seen at Slope Base during the Shallow Profiler EOM anchor inspection. Two anemones are attached to the nearby cable. Credit: NSF-OOI/UW/CSSF, Dive R2256, V22

A deep-sea octopus (possibly Muusoctopus?) seen at Slope Base during the Shallow Profiler EOM anchor inspection. Photo credit: NSF-OOI/UW/CSSF, Dive R2256, V22

An echinothuriid sea urchin at Slope Base during the 2022 recovery of the MJ01A junction box. Credit: UW/NSF-OOI/CSSF, ROPOS Dive R2250, V22.

A deep-sea purple octopus (Graneledone boreopacifica) seen during a survey on the Eastern flank of Axial Caldera. Credit: NSF-OOI/UW/CSSF, Dive R2243, V22

Looking down on a galatheid crab sitting on the rope attached to a marker next to the anchor of the Slope Base profiler mooring in 2900 meters (~9500 feet) of water. A number of venus flytrap anemones are also attached to the hard surfaces here. Photo credit: NSF-OOI/UW/CSSF, Dive R2258, V22

A blue shark investigating the deep profiler recovery frame attached to the front of ROPOS at the Oregon Offshore site. Credit: NSF-OOI/UW/CSSF, Dive R2229, V22