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Guess the real numbers behind scuba diving, see how everyone else guessed, and get the source.
In what year was the Aqua-Lung system patented?
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Real figures with their sources. All Diving facts →
1966
PADI grew from a small startup into the dominant global scuba training organization.
Source: Professional Association of Diving Instructors, via Wikipedia (2025) en.wikipedia.org
about 28 million
That total spans PADI's entire history of certifying new divers worldwide.
Source: Professional Association of Diving Instructors, via Wikipedia (2020) en.wikipedia.org
about 6,600 dive centers
PADI's certified dive center network spans nearly every diving destination in the world.
Source: Professional Association of Diving Instructors, via Wikipedia (2021) en.wikipedia.org
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Each question asks you to guess a real number about scuba diving. After you answer you see how everyone else guessed, then the real figure and where it comes from.
Four stats and one opinion poll. A correct guess earns 100 points plus up to 50 for speed, with a combo bonus for answers in a row. The range next to the right answer earns 40. Opinion polls earn 25 for having your say, and nailing every stat adds 150.
Every stat links to its source, such as government statistics agencies, research organizations and industry groups. Figures are checked against the source before they go live.
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