NOAA Launches Back-to-Back Deep-Sea Expeditions Around American Samoa to Map Critical Minerals
NOAA has deployed two consecutive deep-sea expeditions aboard the Okeanos Explorer around American Samoa to map polymetallic nodule fields and deepwater habitats in the nation's highest-priority region for offshore critical-mineral mapping.
NOAA’s latest survey push targets the abyssal plains of American Samoa with two consecutive missions aboard the research vessel Okeanos Explorer, focusing on a region designated as the nation’s highest priority for offshore critical-mineral mapping NOAA has launched two back-to-back deep-sea expeditions around American Samoa aboard the Okeanos Explorer. The first leg runs from August 20 through September 17, 2026, deploying multibeam sonar and remotely operated vehicles to chart seamounts, deepwater coral and sponge communities, and polymetallic nodule fields in waters that remain largely unmapped.
Mission details confirm the vessel departed Rarotonga on August 20 to begin operations with operational parameters including a dive range spanning abyssal plains from 656 feet down to 19,685 feet and confirmed live telepresence streaming for both Deep Discoverer and Seirios provided in real time. The data collected across these depths will be placed in the public domain, establishing a baseline for federal and territorial resource management decisions in a region where geological survey coverage is just beginning.
The designation of American Samoa’s deep waters as a highest-priority mapping zone reflects the intersection of resource potential and scientific need. Polymetallic nodule fields are targets for critical-mineral interest, yet they exist alongside diverse benthic habitats that require documentation. Mapping these features simultaneously allows researchers to distinguish mineral deposits from biological communities, generating the foundational data needed to manage extraction opportunities while preserving habitat integrity in an ecosystem that has seen little previous characterization.
Running two back-to-back expeditions suggests a deliberate attempt to maximize survey efficiency within the vessel’s operational window. By chaining missions together, NOAA can cover a broader swath of the seafloor without the gap that would come from returning home between legs, turning the Okeanos Explorer into a continuous mapping platform. This approach accelerates the fill-in of unmapped areas across the abyssal plains, converting blank spots on regional charts into searchable geospatial records before policy or development timelines outpace the available data.
The expedition’s structure also emphasizes accessibility, with dive operations streamed live for anyone following the coverage of Expedition 2606. This openness means every descent is instantly viewable, turning what might traditionally be an isolated data collection run into a shared public record. With the maps and dive updates available as they are produced, American Samoa’s deep ocean is being documented in real time, setting a precedent for how future resource surveys can balance rapid characterization with transparent access to marine infrastructure details.