Breathing underwater, like eating fireworks, constructing a monument, and getting married, should only be attempted if you're confident you can do it. Today's Groupon gives you all the skills you need to mingle with the mermaids: for $23, you get a discover scuba diving session (a $100 value) at Down Under Dive Shop, located in Gulf Shores.

Down Under Dive Shop's PADI-certified professionals introduce curious landfarers to the art of breathing underwater in a safe setting. In an initiatory session, students take to shallow water as they develop familiarity with equipment, learn about scuba safety, and pick up basic skills for subaquatic maneuvering. Though the class won't churn out scuba divers certified to dive alone, the hours count toward eventual scuba or open-water certification, as well as putting to rest a persistent fear of bathtubs and really big puddles. Down Under Dive Shop supplies all of the necessary armament for a successful maritime sally, including a mask, snorkel, fins, buoyancy compensating jacket, and air tank.