The oxygen tank enables explorers to venture into unknown frontiers, from the craters of the moon to the discotheques of the ocean floor. Put on your dancing fins for today's Groupon: for $29, you get a two-hour Discover Scuba class at ASK Divers (a $100 value). Once Discover Scuba is complete, this Groupon also entitles you to continue training with $100 off the Open Water Diver course ($320/semiprivate lesson, $500/private).

Up to four merpersons per lesson are fitted for gear and briefed on basics before wading into an Olympic-size indoor pool to loosen their gills and practice skills. The introductory class schools scuba squires on fundamental techniques necessary for open-water dives, such as how to safely descend and ascend watery depths to evade lingering Baywatch extras. After proving aquatic adroitness, divers can voyage to the deep end of the pool to take in subaqueous sights and play underwater games such as Pin the Tentacle on the Mollusk.

Basic scuba gear is provided for this class; however, along with swimsuits and towels, divers are urged to get their own masks, snorkels, and fins to ensure comfort. Classes are typically held at the YWCA on Brown Street or the Replica Aquatic Center in Fort Bliss, but location may vary depending on scheduling availability.