Between August and October 2018, E/V Nautilus moved from the west coast of North America to the Hawaiian Islands, with expeditions to Lō‘ihi Seamount and the Papahānaumokuākea Marine National Monument. The transit across the North Pacific Ocean provided the opportunity to fill in gaps in seabed mapping coverage, add data for the US Extended Continental Shelf (ECS) Project, and map the lava ocean entry sites from the 2018 eruption of Kīlauea Volcano. Nautilus also completed targeted mapping of seamounts and mapped a section of the Area of Particular Environmental Interest One (APEI-1) in the Clarion Clipperton Fracture Zone (CCFZ) designated by the International Seabed Authority (ISA).