Highlights: 00:35:07 Yellow stalked crinoids - Anachalypsicrinus nefertiti 00:46:26 Hexactinellid sponges & demosponges 00:47:41 Hexactinellid sponges & demosponges 00:54:30 Stalked crinoids & sea pens

The soft sediment is dominated by stalked crinoids, ophiuroids, echinoids, sea pens and holothurians. A 50m tall carbonate cliff with burrows has several large sponges colonising it. On the top of the cliff the substrate is once again soft substrate with a higher abundance of stalked crinoids, sea pens and ophiuroids.

START VIDEO [00:00:00]/03:34 [1] The transect starts on what looks like sand and shell hash from afar but two photos taken prior to the HD video show that is made up entirely of pteropod (pelagic snail) shells. The ROV moves right passing some small carbonate feature, stopping after 30 seconds before at [00:01:00] proceeding forwards slowly at first then normally by [00:02:00] [2] where the sediment transitions to mud. This area is presents with sparse cf. Anthoptilum sea pens (OTU1107) and mixed echinoderms especially white echinoids (OTU559), Ophiomusa lymani ophiuroids, Hymenaster sea stars, and Mesothuria intestinalis holothurians. [00:18:00] [3] While many of the previous fauna continue, the dominant fauna becomes stalked crinoids (probably Democrinus sp . , OTU1103). [00:26:00]-[00:28:00] The ROV stops. [00:32:00] A strange clear object is encountered, possibly living (e. g. a tunicate or jellyfish) or litter, possibly attached to a stalked crinoid. [00:34:00] A boulder is encountered colonised by Anachalypsicrinus nefertiti, shortly followed at [00:36:00] by another with mixed sponges/crinoids/corals associated. Two holes are visible behind the boulder suggesting a carbonate crust lies beneath the sediment. [00:44:00] [4] The ROV meets the escarpment feature in the form of a high (5m+) carbonate cliff. The cliff host mixed sponges (especially cf. Farreidae OTU1142), chrysogorgiid corals, and many unknown dark spots (likely fossil stalked crinoid anchor points). [00:53:00] [5] the ROV rises up the cliffs over a couple of terraces of mud veneered sloping carbonate, then onto continuous mud veneered sloping carbonate, densely colonised by mixed stalked crinoid species, among other fauna. Scattered/patchy pebbles are encountered, and by [01:06:00] the carbonate is no longer visible. [01:12:00] increasing numbers of Holothurians (possibly Amperima sp . ) become co-dominant with the stalked crinoids continuing until the end of the transect. [01:27:00]-[01:35:00] the ROV stops for pushcores. [01:43:00] the ROV stops, and the END VIDEO [01:44:00]/05:19.