North American Divers Company, Greensboro

As the biggest, deepest mystery on earth, the ocean offers nearly endless opportunities for exploration—if only humans could breathe underwater. That's where North American Divers Company comes in, both training students and leading expeditions to exotic destinations ranging from the Caribbean to the neighbor's koi pond. Classes are available for divers ranging from beginners hoping to get acquainted with diving and equipment to advanced divers seeking expert certifications.