Scuba diving is the only way left to find hidden treasure, befriend a nautical skeleton, or strap a huge tank to yourself. Explore the possibilities with today's Groupon: for $12, you get a Try Scuba session at Underwater Playground in Edgewood (a $25 value).

Underwater Playground submerges aspirant deep-sea divers, pruned snorkelers, and strident swimmers in a waterlogged array of parties, lessons, and aquatic aerobics. Eschew dangerous, unsanctioned gill-insertion procedures with a Try Scuba session, a beginners' course laying out the basics of subaqueous submersion. After each Cousteau-in-training has suited up with professional diving equipment, a Scuba Schools International (SSI) dive professional leads a two- to three-hour lesson at Underwater Playground's heated, saltwater pool before participants make their first tile-scouring dive in search of priceless treasures and wayward swim trunks.

Upcoming Try Scuba sessions are on April 15 and 26 at 6:30 p.m., and the calendar will be updated continuously with future dates. Interested flipper-floppers can fish out today's Groupon for an added $25 credit toward any continued certification class, such as the open-water diver course, an all-inclusive sea romp that entails classroom and pool instruction, use of all required gear, and a certification card guaranteeing the right to dive anywhere in the world.