Three UK explorers who endured frostbite and food shortages had mixed feelings at the end of their pioneering Arctic research expedition. On Wednesday, two aircraft landed on the floating Arctic ice to collect Pen Hadow, Ann Daniels and Martin Hartley.
They have been measuring the thickness of the sea ice as they trekked across the Arctic. Expedition leader Pen Hadow told the BBC that the experience had been "very tough".
The explorers hope their data will help scientists better understand the impacts of global warming in the region.
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