One of the earliest "rebreather" designs. In 1680, Giovanni Borelli envisioned a diver carrying a large bag of air from which the diver breathed, as necessary. Image courtesy of Cayman Island Twilight Zone 2007 Exploration, Giovanni Borelli 1680, Library of Congress July 1, 1909, NOAA-OE.
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Cayman Islands Twilight Zone 2007
