Table 1. ROV transects on the Hebrides Terrace Seamount together with ROV CTD range for temperature, salinity, and estimated oxygen % and estimated aragonite saturation state.

	Dive 035	Dive 036	Dive 037
Date of dive (dd/mm/yyyy)	09/06/2012	10/06/2012	10/06/2012
Transect length	3157 m	1040 m	2972 m
Subset # of images analysed	319	84	292
Subset duration (hours:minutes:seconds)	06:56:30	01:42:57	06:26:24
Geomorphology	flank	summit	flank
Depth range	1238–1695 m	1004–1021 m	1234–1661 m
Temperature range	4.56–6.40	7.50–7.62	3.97–5.43
Salinity range	34.97–35.17	35.22–35.24	34.95–35.09
Oxygen saturation (%)	63.6–83.8	58.3–74.3	62.3–82.0
Aragonite saturation state	0.77–1.40	0.87–1.36	0.77–1.35
Total # observed megafauna species	80	33	56