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 $20, you get a Scuba Discovery course (a $40 value) at 1 877 Scuba USA in Paramus.

Certified, fully submersible instructors guide developing divers in the introductory Scuba Discovery course, demonstrating safety procedures before leading a tour of a nearby marine environment. Friendly teachers show students the ropes, pulleys, and trained seals of recreational diving, illustrating buoyancy control, equipment use, and techniques for equalizing mismatched ears. Interested divers can enroll in later training dives to gain their open-water certification and taunt fish still struggling to master artificial lungs. All students must have rudimentary swimming and breathing abilities. Ambitious divers that decide to go for full Scuba certification will receive a $20 credit toward entry to the required Scuba lessons.