Scuba diving opens up marvelous underwater vistas to the human eye, and it allows sufferers of terraphobia to finally live a life of ease and comfort. Secede from dry land with today's Groupon: for $39, you get an introductory scuba-diving lesson at Dive California's on-site training pool in Loma Heights (a $100 value). All scuba equipment is included, but a mask, fins, and boots are an additional $15.

Dive California is a full-service dive shop and training center staffed by scuba-diving instructors and divemasters experienced in military, technical, and recreational diving. The PADI-certified instructors guide divers through the fundamentals of scuba safety and prepare them emotionally to hear their breath sound like Darth Vader's. This introductory dive is designed for first-time divers. All participants should be older than 11 and refrain from donning inner tubes in animal shapes.

By appointment only.