EX2304 NOAA Ocean Exploration Deep Sea Animal Research Center at University of Hawai'i at Manoa contentProvider Ashley Marranzino NOAA Ocean Exploration Affiliate https://orcid.org/0000-0002-6451-1139 distributor 2026-05-12 eng

From July 14 - July 25, 2023 (Kodiak, Alaska to Unalaska, Alaska), NOAA Ocean Exploration completed the Seascape Alaska 3: Aleutians Remotely Operated Vehicle Exploration and Mapping expedition (EX2304), a combined mapping and remotely operated vehicle (ROV) expedition exploring the deep waters around the Aleutian Islands. Operations during this 12-day expedition included the completion of eight ROV exploration dives, including six full dives and two dives that were abandoned during descent due to various circumstances. ROV dives were conducted in water depths ranging from 780 m to 2800 m for a total of nearly 27 hours of bottom time (not including mid-water transects), focusing on exploring benthic habitats (including seep communities), geohazards, and water column communities. EX2304 also collected over 15,000 square kilometers of seafloor bathymetry and associated water column data using an EM 304 multibeam sonar. All data associated with this expedition will be archived within 120 days of the end of the expedition and will be publicly available through the NOAA Archives. This research used data collected during NOAA Ship Okeanos Explorer expedition EX2304, led by NOAA Ocean Exploration. Taxonomic identifications provided by the Deep-sea Animal Research Center at University of Hawai'i at Manoa. Additional Data Resources: Project website: https://oceanexplorer.noaa.gov/expedition/ex2304/ Expedition report: https://repository.library.noaa.gov/view/noaa/70924 Data was archived with NOAA’s National Centers for Environmental Information (NCEI): https://www.ncei.noaa.gov/waf/okeanos-rov-cruises/ex2304/ Annotation dataset (provided by DARC) archived with NCEI: https://oer.hpc.msstate.edu/okeanos/ex2304/Eventlogs/VideoAnnotations-Version2/Specimen/ Sample Data: Sample records archived at NCEI: https://www.ncei.noaa.gov/data/oceans/archive/arc0241/0311845/1.1/data/0-data/EX_SODA_Archive_September_2025/exports/EX2304_Cruise_Specimens.xlsxBiological samples were sent to the Smithsonian National Museum of Natural History (SNMNH): https://collections.nmnh.si.edu/search/iz/Geological samples were sent to Oregon State University’s Marine Geological Repository: https://osu-mgr.org/noaa-exWater collected and filtered for eDNA analyses were sent to the SNMNH. Sample catalog numbers: https://geome-db.org/record/ark:/21547/FjJ2

Samplingevent GBIF Dataset Type Vocabulary: http://rs.gbif.org/vocabulary/gbif/dataset_type_2015-07-10.xml This work is licensed under a Creative Commons Attribution (CC-BY 4.0) License. Creative Commons Attribution 4.0 International https://spdx.org/licenses/CC-BY-4.0.html CC-BY-4.0 https://www.ncei.noaa.gov/waf/okeanos-rov-cruises/ex2304/ Aleutian Islands, Alaska -170 -150 58 50 2023-07-14 2023-07-25 From July 14 - July 25, 2023 (Kodiak, Alaska to Unalaska, Alaska), NOAA Ocean Exploration completed the Seascape Alaska 3: Aleutians Remotely Operated Vehicle Exploration and Mapping expedition (EX2304), a combined mapping and remotely operated vehicle (ROV) expedition exploring the deep waters around the Aleutian Islands. Operations during this 12-day expedition included the completion of eight ROV exploration dives, including six full dives and two dives that were abandoned during descent due to various circumstances. ROV dives were conducted in water depths ranging from 780 m to 2800 m for a total of nearly 27 hours of bottom time (not including mid-water transects), focusing on exploring benthic habitats (including seep communities), geohazards, and water column communities. EX2304 also collected over 15,000 square kilometers of seafloor bathymetry and associated water column data using an EM 304 multibeam sonar. All data associated with this expedition will be archived within 120 days of the end of the expedition and will be publicly available through the NOAA Archives. This research used data collected during NOAA Ship Okeanos Explorer expedition EX2304, led by NOAA Ocean Exploration. Taxonomic identifications provided by the Deep-sea Animal Research Center at University of Hawai'i at Manoa. This research used data collected during NOAA Ship Okeanos Explorer expedition EX2304, led by NOAA Ocean Exploration. Taxonomic identifications provided by the Deep-sea Animal Research Center at University of Hawai'i at Manoa. unknown NOAA Ocean Exploration ROV expeditions are conducted according to procedures as outlined by Galvez et al., 2025: https://repository.library.noaa.gov/view/noaa/70281 Expedition report: https://repository.library.noaa.gov/view/noaa/70924 Aleutian Islands, Alaska ROV expeditions are conducted according to procedures as outlined by Galvez et al., 2025: https://repository.library.noaa.gov/view/noaa/70281. 2026-05-12T22:23:07.809+00:00 dataset EX2304_Cruise_Specimens.xlsx ASCII Excel https://www.ncei.noaa.gov/data/oceans/archive/arc0241/0311845/1.1/data/0-data/EX_SODA_Archive_September_2025/exports/EX2304_Cruise_Specimens.xlsx EX2304_Annotations ASCII Excel https://oer.hpc.msstate.edu/okeanos/ex2304/Eventlogs/VideoAnnotations-Version2/ https://ipt-obis.gbif.us/resource?id=ex2304_videoannotationsandsamples/v1.1.xml