To celebrate its 50th anniversary, Scuba Schools International is offering a free online course to its members about the history of diving.

The course is available to anyone with a MySSI.com account, and shows how the sport has evolved over time, from the growth of certification cards in the 1970s, to the explosion of the industry in the 1980s as the sport became much more mainstream, through the halcyon days of the early 1990s and into the future.

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