Undersea Specialists are a unique and delightful mainstay of our expeditions and you'll find them on nearly every expedition aboard the National Geographic fleet. These aquatic adventurers plunge into both polar and tropical waters to capture stunning, and often surprising, images of the vibrant world beneath our ships. Here, they share some of their favorite recent finds, from a tiny reef octopus to a magnificent sunflower sea star with 24 arms. Get Inspired By Photos, Videos, Webinars, Stories, And Exclusive Offers. Sign Up