In extremely deep waters (two miles deep), the vast sea appears empty. But as naturalist and artist Sophie Webb shows us, it is full of fascinating—yet difficult to study—life. Together with her shipmates, Sophie counts and collects samples of life in the deep ocean, from seabirds to dolphins, from winged fish to whales. Only their long-term field work can really help scientists determine the health of these remarkable creatures who need the clean deep ocean to survive.