FKt250220 Dive Information
SOI Data Manager,
Investigator
Platform
SuBastian
ROV
Dive Information
Devices
Related Data Sets
Dive Information
Total Dive Count: 9
Events
S0797
Start
2025-02-28T23:26:55.425
Locale
NotProvided
NotApplicable
Stop
2025-03-01T09:04:51.877
Nav Type
DVL/USBL/INS
Details
The primary aim of this dive is to test the ROV.
If ROV is functional we will take the opportunity to survey the site and commence organism collections (an opportunity to test on board science protocols). We intend to drop into a site that is around 450m deep at the bottom of a multi-pinnacle seamount called Humpback Seamount to the west of Saunders Island. We will proceed up the “hill” collecting specimens as we go. This site was selected as the most “likely” to have cold water coral reef within the wider study according to recent habitat suitability modeling (Cordes et al, 2023). Below are a varied list of desired objectives. Core research aims for this test dive include specimens collection for species discovery, testing of BBC camera, the filming / collection of deep-sea creatures for behaviours, testing of photogrammetry camera (would be good to get test data).
S0798
Start
2025-03-02T07:03:27.915
Locale
NotProvided
NotApplicable
Stop
2025-03-03T02:30:22.312
Nav Type
DVL/USBL/INS
Details
This is a multi-objective dive.
We intend to drop into a site that is around 620m deep at the bottom of an incline with potential steep walls towards the end of the dive. We will survey the geology of the features on the side of the island before proceeding up the “hill” collecting specimens as we go.
1. Cover the section between 620m and 550m for geology
2. Locate vertical scarp for photogrammetry
3. If there are areas to pushcore we would like 6 for GoSouth and 3 for Ocean Census
4. Transit at ~0.5 kts within site of the seafloor to the base of the steep incline around 400 m
5. Fire niskins during the transit
6. Climb the steep walls from 400 m to 200 m depth, sampling along the way
7. Should we find a steep hill we will undertake a photogrammetry survey
S0799
Start
2025-03-04T07:16:42
Locale
NotProvided
NotApplicable
Stop
2025-03-04T22:59:17
Nav Type
DVL/USBL/INS
Details
This is a multi-disciplinary dive on the south-eastern end of the Montagu Bank, focusing on a depth range of 2300m to 1900m.
1. Descend to a maximum depth of 2300m.
2. Head up slope (approx. 280 degrees) to the start of the wall/feature.
3. Take a set of push cores at base of feature.
4. Head south cutting the wall at an angle, moving up slope.
5. Once an interesting depth stratum is identified, stay with it and move laterally along wall to the south.
6. At roughly mid-point of the dive, begin moving north along the top of the wall.
7. Continue this heading until end of dive (around 1900m).
S0800
Start
2025-03-05T01:46:36.98
Locale
NotProvided
NotApplicable
Stop
2025-03-06T01:31:32.125
Nav Type
DVL/USBL/INS
Details
This is a multi-disciplinary dive on the southern part of our multibeam transect area,
called southern trench site, focusing on a depth range of 2900m to 2600m.
1. Descend to a maximum depth of 2900m.
2. Head up slope to the start of the wall/feature.
3. Take a set of push cores at base of feature.
4. Head northeast cutting the wall at an angle, moving up slope.
5. Once an interesting depth stratum is identified, stay with it and move laterally
along wall to the northeast.
6. At roughly mid-point of the dive, begin moving north along the top of the wall.
7. Continue this heading until end of dive (around 2600m).
S0801
Start
2025-03-07T22:55:58.584
Locale
NotProvided
NotApplicable
Stop
2025-03-08T15:30:11.712
Nav Type
DVL/USBL/INS
Details
This is a multi-disciplinary dive on the northern part of our multibeam transect area, called southern trench site, focusing on a depth range of 3780m to 3200m.
1. Descend to a maximum depth of 3780m.
2. Head up slope to the start of the wall.
3. Take a set of push cores at base of wall.
4. Head northeast cutting the wall at an angle, moving up slope.
5. Follow waypoints along wall face.
6. Collect 3 PC at top of wall for GoSouth
7. Continue until end of dive (around 3200m).
S0802
Start
2025-03-09T02:28:47.758
Locale
NotProvided
NotApplicable
Stop
2025-03-09T15:32:28.425
Nav Type
DVL/USBL/INS
Details
This is a multi-disciplinary dive on a small seamount in between Saunders and Candlemass Islands, focusing on a depth range of 800 – 400 m
1. Descend to a maximum depth of 800m.
2. Head up slope along the edge of a slide feature
3. Take a set of two push cores in sediment at start, mid, and end
4. Follow waypoints along the side of the slump feature
5. Collect new species along the way
6. If there is time left at the top of the seamount, survey along the top
7. Leave bottom to be on deck by 1600 hrs
S0803
Start
2025-03-09T19:22:38.947
Locale
NotProvided
NotApplicable
Stop
2025-03-10T21:30:37.327
Nav Type
DVL/USBL/INS
Details
This is a multi-disciplinary dive on the northern part of our multibeam transect area,
called southern trench site, focusing on a depth range of 3780m to 3200m.
1. Descend to a maximum depth of 1221m.
2. Head up slope to the start of the ridge/wall feature.
3. Take 2 push cores at base of wall.
4. Head west, follow waypoints moving up slope and along the ridge/wall feature
5. Take 2 push cores in the mid-section of the dive.
6. Head southwest, following waypoints - continue until end of dive (around 600m).
7. Collect 2 push cores at top of wall for GoSouth.
8. If time left, continue to shallow up towards the crest of the plateau and continue dive until weather window allows for ROV recovery.
S0804
Start
2025-03-15T02:29:12.829
Locale
NotProvided
NotApplicable
Stop
2025-03-16T01:35:59.546
Nav Type
DVL/USBL/INS
Details
This is a specimen collection dive on the north-east side of Quest Caldera, focusing on previously recorded heat anomalies and associated benthic habitats. Descend to a top of caldera rim (~720m) and undertake M3 sonar survey – 3 x 500m
survey lines at a height of 60 m. Descend to lower survey way point at 990 m depth down east caldera slope. Take 2 push cores at base of wall. Ascend caldera slope collecting specimens until reach rim area. Take 2 push cores in the mid-section of the dive. Use processed sonar information to target topographically interesting locations. Head up slope along the ridge/wall feature running northwest. Once at the crest/plateau continue to shallow up northwards until the end of the dive. Collect 2 push cores at top of caldera.
S0805
Start
2025-03-19T10:55:48.666
Locale
NotProvided
NotApplicable
Stop
2025-03-20T13:16:50
Nav Type
DVL/USBL/INS
Details
This is a specimen collection dive on the north section of a seamount-adjacent bank to the west of South Georgia just outside the SGSSI EEZ and 55nm west of West Shag
Rocks. The site was selected through identifying topographically similar features to the West Shag Rocks site, which was known to contain a high density of Vulnerable Marine Ecosystems (VME).
1. Descend to bottom waypoint (1295m) and conduct collection survey up slope.
2. Take 2 push cores at base of wall.
3. Continue visual survey up slope.
4. Take 2 push cores in the mid-section of the dive.
5. Move to shallower section of dive area undertaking visual survey and sampling of
fauna.
6. Collect 2 push cores at end of dive on bank.
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