plant reeds and goat stomachs
About 500 BC: he used a hollow reed as snorkel to remain unobserved.
Relief carvings made at this time show Assyrian soldiers crossing rivers using inflated goatskin floats. Several modern authors have wrongly said that the floats were crude breathing sets and that they show frogmen in action
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Jacques-Yves Cousteau invented the "aqua lung" or the scuba tank, snorkel, goggles, and the Aqua-Lung was invented in Paris during the 1942-1943 winter by two Frenchmen: the engineer Émile Gagnan and the lieutenant de vaisseau (Ship-of-the-Line Lieutenant) Jacques-Yves Cousteau.
-Wikipedia(: