Henry Fleuss (18511932) improved the rebreather technology. (Source)
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The Rouquayrol-Denayrouze apparatus was the first regulator to be mass-produced (from 1865 to 1965). In this picture the air reservoir presents its surface-supplied configuration. (Source)
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Diver looking at a shipwreck in the Caribbean Sea (Source)
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The undersea kelp forest of Ana Capa off of the coast of Oxnard, California (Source)