Atlantic Edge Dive Center's dive-masters might technically be classified as land mammals, but they spend enough time under water to earn the honorary title of amphibian. They spend days and nights teaching and leading dives, whether they're arming curious beginners with basic skills in one of their on-site swimming pools, or conducting open water certification tests off the coast. They go beyond simply certifying students for adventure: they provide rescue diving, dive master, and instructor training as well.

Their passion for the aquatic pastime draws them to all kinds of watery outposts. They lead excursions to the Florida keys to help rehabilitate the coral reefs surrounding the islands, and dive into the relatively calm waters of the tanks in the Baltimore National Aquarium, where they have a chance to see 53 species of fish feed in the secret underwater cafeteria.