A more recent version of the rebreather allows this diver to swim over a Caribbean reef without bubbles. In addition to conserving air, this technique is particularly useful for marine biologists ñ 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
