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What famous scientist and inventor participated in the invention of the Aqua-Lung?
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Scientist Jacques Cousteau was participated in the invention of the Aqua-Lung.
As per Wikipedia ” Aqua-Lung was the original English name of the first open-circuit, self-contained underwater breathing apparatus (or “SCUBA”) to reach worldwide popularity and commercial success. This class of equipment is now commonly referred to as a diving regulator or demand valve. The Aqua-Lung was invented in Paris during the winter of 1942€“1943 by two Frenchmen: the engineer Émile Gagnan and Naval Lieutenant (“lieutenant de vaisseau”) Jacques Cousteau. It allowed Cousteau and Gagnan to film and explore more easily underwater.
Watch this video on Jacques Cousteau