The Professional Association of Diving Instructors (PADI) is the world's largest recreational diving membership and diver training organization founded in 1966 by John Cronin and Ralph Erickson. Cronin was originally a NAUI instructor who decided to form his own organisation with Erickson, and to break diver training down into different courses instead of the single universal course then prevalent. read more »
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Official website: http://www.padi.com