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Q&A: Trapped under ice

The team behind a new Antarctic ice-mapping submarine is breathing a sigh of relief at its safe return, Daniel Cressey reports over on Nature News. The Autosub 3 robot submarine was sent out early this year on a 110-kilometre journey under Pine Island Glacier, which juts out into the Admunsen Sea. But, Cressey writes, there was no guarantee that the sub would ever come back: 

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