Exploring the Depths of the 'Hidden' Arctic Ocean

Katrin Iken and Elisabeth Calvert prepare to dive into 30-degree water in the Arctic ocean.

hide captionKatrin Iken and Elisabeth Calvert prepare to dive into 30-degree water in the Arctic ocean. Shawn Harper holds the safety line.

Jeremy Potter/Courtesy of NOAA

Researchers call it the Hidden Ocean. It's the deepest part of the Arctic Ocean, north of Alaska. More than a mile deep, it is locked in ice most of the year. Now, an international team of more than 40 scientists is probing the Hidden Ocean, working from a U.S. Coast Guard icebreaker. NPR's Richard Harris recently spent some time with the expedition and sent back this audio postcard from the sea ice.

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