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Recreational scuba diving is defined as pleasure diving to a depth of 130 feet without decompression stops. Several scuba-certifying agencies offer training for divers, from beginners to experts. Three of the agencies are the Professional Association of Diving Instructors (PADI), the National Association of Underwater Instructors (NAUI) and Scuba Schools International (SSI). Basic classes involve classroom instruction and training pools and open-water settings. The most popular courses last from 4 to 8 weeks.