Highlights: 00:25:48 Lophelia 00:29:33 Yellow globose sponge 00:34:10 Cup corals & anemones 00:43:20 Antipatharian coral 01:04:38 Antipatharian coral 01:25:23 Cup corals & anemones

This escarpment feature is a continuation of that surveyed on T40 (to the northeast) and T50 (to the southwest). The ridges, which continue along either side of the transect, appear to be sandstone and include some walls over 5 m in height. Apart from the anemones on overhangs, Cidaris cidaris and some fish species including two conger eels, fauna is sparse.

START VIDEO [00:00:00]/19:25 [1]: The transect starts briefly on sand with Cidaris cidaris [00:00:24] [2]: the ROV quickly reaches an area of cobbles and boulders and an assemblage of predominantly encrusting fauna with dominant stylasterid hydrocorals. The landscape gently slopes to the left. [00:04:00] [3]: sand with urchins (C. cidaris and Araeosoma fenestratum) [00:05:00] [4]: an area of broken bedrock, still sloping off to the left, this initial section is dominated by an encrusting globose sponge (OTU75) [00:06:00] [5]: changes to a cobble/boulder field with gravelly sand, stylasterids again dominating along with C. cidaris. Occasional Lophelia pertusa colonies are present. At [00:11:00] there is an interesting area of broken carbonate crust before the ROV proceeds downslope over broken carbonate boulders and cobbles, still hosting a similar assemblage [00:16:00] [6]: continuing downslope sparse cobbles on gravelly sand display a sparse encrusting community. [00:18:00] [7]: this becomes coarse gravelly/pebble and Reteporella bryozoans become more apparent, joined by stylasterids as before. [00:21:00] [8]: An area of broken carbonate crust is again dominated by encrusting globose sponges (OTU75) although a couple of L. pertusa colonies are present. [00:23:00] The ROV proceeds over the top of this with no views of the seabed until [00:24:00] [9]: a small area of higher broken carbonate hosts L. pertusa colonies, but the main assemblage here continues into the landscape beyond and is dominated by stylasterids and Reteporella sp. The ROV spends some time zooming here (possibly waiting for the ship to catch up/ROV pilot change) then comes off bottom and turns 180° back toward the small escarpment it just descended over. [00:31:00] [10]: gravelly sand and scattered pebbles are sparsely colonised by urchins, before reaching [00:32:00] [11]: an area of broken carbonate cobbles and boulders at the foot of the escarpment (with Reteporella) [00:33:00] [12]: the escarpment feature consists of sloping carbonate and large boulders of broken carbonate/bedrock, Desmophyllum cf. dianthus is found on overhanging carbonate crust, and a there are few L. pertusa colonies. The encrusting globose sponge again dominates upper surfaces. The ROV traverses left. [00:36:00] [13]: gravelly sand and pebbles, occasional cobbles host urchins and sparse encrusting fauna. [00:38:00] [14]: more escarpment (about 1m high), again encrusting sponges, purple anemones (OTU478), occasional Lophelia colonies and some other corals on the surface above. ROV turns corner 90° at [00:43:00] and follows crust back until just a shallow lip. [00:47:00] [15]: cobbles on sand at top edge of escarpment (hydroids/sponges/ Cidaris). The ROV does a few turns then proceeds 180° to previous course, back over escarpment shelf. A similar cobbles on sand assemblage continues down slope then reaching a sloping terraced escarpment feature. [00:52:00]-[00:55:00] limited views of seafloor. [00:55:00] [16]: cobbles/boulders precede downslope in varying density on gravelly sand with Reteporella and Stylaster dominating. ROV turns 90° right at [01:03:00], meets a Trissopathes/Chrysopathes black coral and stops for a moment to photograph. Then 45° turn upslope at [01:05:00]. [01:12:00] [17]: meet the foot of a large (~4-5m) carbonate escarpment (and a Conger eel), ascend then traverse along left. Serpulids sparsely adorn the rock face, lines of Desmophyllum cf. dianthus and rare L. pertusa colonies are also encountered. Views above show the stylasterid, Reteporella assemblage on cobbles. [01:37:00] [18]: climb over the escarpment and head upslope over that cobble/boulder assemblage until [01:40:00] [19]: small ~1m escarpment sparsely colonised, traverse right. [01:52:00] [20]: climb over escarpment again cobbles, boulders, Reteporella. 01:054 [21]: Meet another step, stop but don’t traverse, Desmophyllum and serpulids, [01:57:00] [22]: cobbles and boulders, then sloping carbonate, back to cobble boulders, then broken carbonate boulders and cobbles, all with the Reteporella assemblage. END VIDEO [02:03:00]/21:29.