Oceanographic data and ROV dive-related multimedia and information collected during the EX1504L4 (Campaign to Address Pacific monument Science, Technology, and Ocean NEeds (CAPSTONE) Leg IV) expedition on NOAA Ship OKEANOS EXPLORER in the North Pacific Ocean from 2015-09-07 to 2015-09-30 (NCEI Accession 0131887)

This dataset contains oceanographic data collected in the deep waters in and around Papahānaumokuākea Marine National Monument (PMNM) in the Northwestern Hawaiian Islands and Johnston Atoll. The primary goal for this cruise was to collect baseline data and information to support priority NOAA science and management needs. The expedition is part of a three-year Campaign of Expeditions (Campaign to Address Pacific monument Science, Technology, and Ocean NEeds or CAPSTONE) focused on exploring deepwater marine protected areas in the Pacific. Operations for this cruise included the 24-hour collection of ship navigation data and scientific computing system data, which comprises of meteorological and oceanographic sensor data, as well as water column profile data. The ship also conducted daytime ROV dives that focused in depths between 250 and 6,000 meters, and included high-resolution visual surveys and biological/geological sample collections. Opportunistic CTD rosette operations were completed to collect more information about the environmental parameters at ROV dive sites where collecting the data is considered important to understanding the physical or chemical properties of the overlying water column.