2023-11-29T19:16:57.117

NotApplicable

2023-11-29T19:40:50.256

Test dunk and possible hull/voiths inspection

2023-12-04T18:04:47.159

NotApplicable

2023-12-05T05:51:13.601

This 12-hour dive will focus on visiting the most active octopus nursery on Dorado Outcrop, between Markers K, R, and W. Our priorities are, in order, to (1) collect qualitative imagery over this area for comparing octopus density with prior years; (2) recover the numerous experiments deployed at Marker W (i.e. animal shelters, an OsmoSampler, a temperature logger, microbe traps, but NOT the bag of wood), along with comparison rock and bottom water samples; (3) make temperature and dissolved oxygen measurements at Marker R/W vent sites; (4) use the SUPR sampler to sample venting fluids and background bottom water; (5) collect high-priority specimens; and (6) trial deep-sea light deployment and filming. We will not be collecting sediment push cores nor doing heat flow measurements on this dive, but we will trial the heat flow probe power and comms. NOTE: If we arrive on station early, we will start the dive early and add in time for collecting quantitative photo transects on the outcrop. We will still recover for midnight ROV on deck. SOI equipment needed: Suction sampler High-temperature probe (married to 3rd party anderaa oxygen probe) Excaliber Rack of 8 coral quivers on starboard rail 4x 5L Niskin + 2x 2.5L Niskins Bioboxes (1x small with divider, 1x large with two dividers) 1x milkcrate with 1x metal scoop + 1x Net + 1x 3rd party flow concentrator cap 1x milkcrate for deploying light pack for BBC

2023-12-05T11:08:48.199

NotApplicable

2023-12-06T03:07:36.477

This 16-hour dive will focus on visiting the revisiting the new octopus nursery discovered in June, at Marker Q. Our priorities are, in order, to: (1) collect quantitative imagery over this area; (2) inspect for octopus embryos/babies; (3) recover the numerous experiments deployed at Marker Q (i.e. an OsmoSampler, a temperature logger, microbe traps, and a bag of wood), along with comparison rock and bottom water samples; (4) make temperature and dissolved oxygen measurements at Marker Q vent sites; (5) use the SUPR sampler to sample venting fluids and background bottom water; (6) deploy a fast-flow OsmoSampler and HOBO Dissolved Oxygen Probe at Marker Q (7) collect high-priority specimens; and (8) allow time for BBC filming. We will not be collecting sediment push cores nor doing heat flow measurements on this dive.

2023-12-06T11:04:15.973

NotApplicable

2023-12-06T18:12:43.59

This 16-hour dive will focus on revisiting the vent site and skate nursery discovered in June on Tengosed. Our priorities are, in order, to: (1) at the vent site, recover a T logger, measure temperature and dissolved oxygen, deploy a fast flow osmosampler, and collect fluids (2) near the vent site, collect samples of the ledge and scarp sediment, plus a Niskin (3) collect transect imagery over the vent site and skate park nursery; (4) at the skate park, investigate for venting, collect egg cases, a rock, and a Niskin (5) collect high-priority specimens (priorities: octopus > Primnoid or Chrysogorgid coral > skate eggs > echinoderms > black coral) (6) if time allows, explore the slump feature north of the skate park for escarpment exposures We will not be collecting standard sediment push cores (though we might use them for horizontal coring in exposed escarpment) nor doing heat flow measurements. As this location does not have high priority fauna for BBC filming, no time is blocked for that activity (though we will bring the light pack just in case...).

2023-12-06T21:10:00.619

NotApplicable

2023-12-07T05:01:33.335

Due to having to pull Dive 621 out of the water early for a long line floating towards us, and floating in the direction we were planning to go, that dive was ended early to recover the ROV and cross over the line. After a brief time with the ROV on deck to turn around the vehicle for re- launch, we will go back into the water and descend while following the line towards Skate Park (WP2) on Tengosed. This ~8.5-hour dive will focus on revisiting the skate nursery discovered in June on Tengosed. Our priorities are, in order, to: (1) at the skate park, investigate for venting, collect egg cases, a rock, and a Niskin (2) collect high-priority specimens (priorities: octopus > Primnoid or Chrysogorgid coral > skate eggs > echinoderms > black coral) (3) if time allows, collect transects in area We will not be collecting standard sediment push cores (though we might use them for horizontal coring in exposed escarpment) nor doing heat flow measurements. As this location does not have high priority fauna for BBC filming, no time is blocked for that activity (though we will bring the light pack just in case...).

2023-12-07T10:57:21.398

NotApplicable

2023-12-07T11:14:18.728

This 16-hour dive will focus on revisiting the Dorado Outcrop to recover additional experiments deployed in June 2023. We will start in a sedimented area to allow for a test of the heat flow probe, then move to the base of the outcrop to collect microbe trap experiments and reference rocks and water for microbiome studies. We will then conduct transects moving upslope on the outcrop. After briefly visiting a less vigorous vent at Marker D to check on an animal shelter, we will then focus on recovering experiments and sampling from the Marker K/R/W area, focusing on Marker R. After collecting high-priority specimens, we will use the opportunity of being back in the prime octopus area to capture high quality footage of octopus and predator behavior.

2023-12-07T11:42:23.046

NotApplicable

2023-12-08T03:54:15.018

Continuing abandoned dive. This 16-hour dive will focus on revisiting the Dorado Outcrop to recover additional experiments deployed in June 2023. We will start in a sedimented area to allow for a test of the heat flow probe, then move to the base of the outcrop to collect microbe trap experiments and reference rocks and water for microbiome studies. We will then conduct transects moving upslope on the outcrop. After briefly visiting a less vigorous vent at Marker D to check on an animal shelter, we will then focus on recovering experiments and sampling from the Marker K/R/W area, focusing on Marker R. After collecting high-priority specimens, we will use the opportunity of being back in the prime octopus area to capture high quality footage of octopus and predator behavior.

2023-12-08T11:00:00

NotApplicable

2023-12-09T01:59:11.314

This 16-hour dive will focus on Caballito outcrop. We will start the dive testing the heat flow probe in the abyssal plain, where opportunistic samples will be taken. We will then transit up to the true summit of the outcrop on the northern end of the feature, which has not been explored before. We will look for signs of venting and/or octopus, and also collect transects and high- priority specimens and or sediment push cores and/or rocks.

2023-12-09T10:58:15.689

NotApplicable

2023-12-10T03:51:48.268

This 16-hour dive will focus on collecting footage of octopus and associated shots at the Dorado Outcrop octopus nursery for BBC filming. Octopus specimen collection may occur where scientifically relevant to support key shot needs, guided by the scientists, but no more than two adults can be collected in order to not jeopardize the permission for specimen collection in Costa Rican waters. Scientists will also be logging observational information for correlation with Tator video ingestion for annotation.

2023-12-10T11:46:50.069

NotApplicable

2023-12-11T02:59:28.623

This 16-hour dive will focus on measuring heat flow in the sediment between the Caballito and La Pulpería outcrops, to help understand hydrothermal circulation in oceanic crust. We will start at the end of a heat flow line extending from Caballito, that was done in June 2023, and work our way towards La Pulpería. Depending on results, we may hop over some waypoints and/or continue past the line. The schedule does not budget time for push cores or transects between stations, but collection may happen at the end, as possible

2023-12-11T10:49:46.677

NotApplicable

2023-12-12T02:10:18.578

This 14-hour dive will focus on visiting La Pulpería. The dive will start by visiting an escarpment for the collection of old sediment for age dating. We will then transit to the summit area for imagery and specimen collection. We will end the dive at the octopus nursery at Marker Q for the recovery of experiment and collection of samples

2023-12-12T07:13:08.081

NotApplicable

2023-12-12T20:20:02.966

This 12-hour dive will revisit the Tengosed Seamount. The dive will begin by exploring the southeastern edge of the summit “flat top”, which has not been explored before. After potential specimen collection in this area, we will transit towards a scarp feature with a relatively high density of large coral fans that was visited in June 2023. Then we will transit to the hydrothermal spring at Marker X to recover experiments, make measurements, and collect water samples. It is unlikely that we will collect sediment push cores or heat flow measurements on this dive.

2023-12-13T01:57:38.735

NotApplicable

2023-12-13T12:17:14.044

This 10-hour dive will visit the Marker A area on the northwestern end of Dorado Outcrop. The objectives of this dive are to recover a temperature logger and set of microbe traps from this site, to measure temperature and dissolved oxygen in the venting fluids, to sample vent fluids and nearby rocks and bottom water, and then to collect high-priority animal specimens.

2023-12-13T16:06:01.658

NotApplicable

2023-12-14T04:10:52.497

The final bonus dive of the Fkt231202 expedition will be a 12-hour dive to revisit Fuente Knoll to sample a prominent carbonate ledge and explore for high-priority specimens.