Armed with a PADI certification from Adventure Scuba, students dive into the depths, floating past forests of coral or ancient shipwrecks alive with schools of phosphorescent fish. Aspiring human submarines ease into the process during beginning training sessions, testing out the waters, familiarizing themselves with the gear, and breathing underwater in the 18-foot indoor heated pool. For more advanced adventurers, instructors break out world-renowned Technical Diving International courses, teaching divers how to descend 180 feet into the water while managing decompression and oxygen use. They can also help clients plan and navigate cave dives for underwater archeological digs for cave-mermen fossils.

Making the world's waterways accessible to everyone, Handicapped Scuba Association directors teach divers with disabilities to swim open waters during weekend dives at Lake Travis. They also organize scuba travel jaunts to Cozumel, Mexico or Dominica, where world travelers swim alongside sperm whales and reverse-scale down sea walls and past bubbling volcanic vents.