a skilled worker who can live in underwater installations and participate in scientific research 同义词：oceanaut,
an underwater swimmer equipped with a face mask and foot fins and either a snorkel or an air cylinder 同义词：skin-diver,
An Aquanaut is any individual who remains underwater, exposed to the ambient pressure, long enough to come into equilibrium with his or her breathing media. Usually this is done in an underwater habitat on the seafloor for a period equal to or greater than 24 continuous hours without returning to the surface.
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