It’s not every day that you come face-to-face with a nautilus. But on a submersible dive in Rotuma last year, scientists Whitney Goodell and Charlene Erasito, and sub pilot Yuval Keren got to do just that. Nautilus are deep sea mollusks known for their unique chambered shells. They have been in the ocean since before the dinosaurs, with a fossil record dating back over 480 million years. | National Geographic Pristine Seas