I saw this ship off the coast of North Kohala, but couldn’t immediately identify it because it was too far offshore. Luckily, it hung around and a couple of days later I saw it much closer and stopped to take photos.
The ship is the Nautilus and it’s an exploration vessel operated by the Ocean Exploration Trust and was engaged in research, sponsored by the National Geographic Society. They were studying marine mammal vocalization and local shark diversity and abundance around Hawaii.
For more information about the ship, go to https://oceanexplorer.noaa.gov/technology/vessels/nautilus/nautilus.html. For more information about the research project, go to https://nautiluslive.org/.