A more recent version of the rebreather allows this diver to swim — without releasing bubbles — over a Caribbean reef. In addition to conserving air, this technique is particularly useful for marine biologists as fish behavior is not disturbed by the noise of exhaled bubbles. Image courtesy of Cayman Islands Twilight Zone 2007 Exploration, Mike Lombardi, NOAA-OE.
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Cayman Islands Twilight Zone 2007
