Highlights: 00:22:27 Antipatharian and sea fan 00:22:52 Sea pen 00:24:42 Anemones & cup corals 00:46:46 Orange roughy 00:53:50 Top of escarpment with encrusting & cup-shaped sponges 00:56:19 Hexactinellid sponge 01:20:50 Octopus

The canyon has a ridge along the bottom approximately 40 m in height. The substrate is primarily soft sediment with areas of rock outcrop. Hard ground is colonised by glass and encrusting sponges while the soft ground largely contained xenophyophores,

Aphroditidae sp. and the occasional cerianthid anemone. Grenadiers are common along the canyon floor; invertebrate fauna is similar to that observed on the ridge. The canyon wall is steep and terraced; the bivalve Acesta excavata is present in the crevices as are small clumps of the stony coral species Solenosmilia variabilis. Mobile and stalked crinoids, glass sponges and the black coral Leiopathes sp. are commonly recorded on the hard ground with Benthoctopus sp. seen on one of the ledges. Grenadiers are common with the occasional orange roughy and oreo. Over the crest of the canyon soft sediment containing xenophyophores is prevalent and among these a single glass sponge Pheronema carpenteri is recorded.

START VIDEO [00:00:00]/00:21 [1] Mud with scattered boulders, xenophyophores dominate, boulders are sparsely encrusted but too infrequent to be classed as a biotope mosaic. NB the first minute is unclear, with searching focus and obscured views. [00:05:00] small mud-veneered ledge feature, the ROV proceeds over the edge and descends with bottom visible, continued xenophyophores. [00:07:00] landscape starts sloping upwards. [00:12:00] another mud veneered rock ledge feature which the ROV ascends, then proceeds up steep mud slope. [00:18:00] mud veneered ledge, ROV ascends. [00:21:00]-[00:22:00] sparse boulders with corals (not enough to warrant biotope change). [00:27:00] boulder and cobbles proceed [00:28:00] [2] ledge feature, the ROV proceeds over and descends. Brief glimpse of mixed corals colonising cliff terraces before seabed view obscured during descent. [00:30:00] [3] ROV meets the base of cliff, sand with sparse cup corals. [00:31:00] [4] transition to mud, and mud veneered pebbles, upslope. Ophiomusa lymani dominant. Various small vertical bedrock ledge features are sparsely encrusted, especially with white encrusting sponges among other fauna. [00:38:00] [5] extended area of sloping mud with xenophyophores. [00:40:00] [6] several bedrock ledges, xenophyophores on mud veneered terraces, while sparse mixed corals (especially Stichopathes sp. OTU560) colonise vertical rock. [00:45:00] [7] extended xenophyophores on mud. [00:50:00] [8] sparse encrusted sloping bedrock/cliffs. [00:53:00] [9] Top of cliff, ROV traverses right. Sparse encrusted cliffs, with sparse mixed corals on cobbles/boulders on cliff ledge. [00:56:00]-[00:57:00] stop for imagery then proceed over top of cliff meeting next sparse encrusted mud veneered cliff. [00:59:00] [10] reach top of cliff, pebbles host sparse mixed corals, especially Stichopathes sp. , [01:01:00], transition to broken bedrock cobbles/boulders and denser mixed corals/sponges with yellow lamellate sponges dominating (OTU623). [01:02:00]-[01:03:00] stop for imagery. [01:11:00] Solenosmilia variabilis coral rubble mixed in on slope of broken bedrock boulders before reaching the base of cliff which ROV ascends. [01:12:00] traverse right. [01:15:00] continue ascending. [01:16:00] Coral rubble steep slope until [01:20:00] vertical rock cliff. [01:20:00] reach top of cliff, where some Solenosmilia variabilis colonises the overhanging rock (likely partly responsible for the rubble below, assume there is more along cliff edge laterally from here). [01:23:00] [11] Boulders and cobbles continue the mixed coral community, while xenophyophores dominate intermediate mud slope areas. ROV traverses diagonally right. [01:29:00] ROV moving forwards. [01:47:00] [12] mud and xenophyophores. [02:00:00] ROV starts reversing and lateralling left until END VIDEO [02:00:00]/02:22.