Diving has long been called a thinking person’s sport. This list is for the books that make it one: non-fiction that makes you a safer, sharper, more capable diver. That includes technical, cave, wreck, and rebreather diving accounts, memoirs, and training texts, along with the diving medicine, physiology, and ocean science that deepen your understanding of what’s happening around you and inside your body on a dive. No pure works of fiction or basic open-water guides.