Pictures From Pristine Seas Expeditions in Palau

See some of the most incredible underwater images taken by the pristine seas expedition divers in the waters around Palau, in the Western Pacific.
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This "Robo-Dog" Could One Day Be an Ocean Explorer

Watch a new robot that walks along the seafloor, and looks a bit like a dog that sinks in water, could offer new options for recording aquatic research sites, thanks to work by National Geographic Explorer Marcello Calisti.

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