The Catlin Arctic Survey, a gruelling 10-week expedition to measure the thickness of sea-ice, has ended.
At 1750 BST on Wednesday, two planes landed safely on the floating Arctic ice to collect Pen Hadow, Ann Daniels and Martin Hartley.
Their data will help study the impacts of global warming in the region.
It also reinforces a new forecast, by a leading UK scientist, who says that the Arctic sea-ice could vanish in summertime far sooner than predicted.
By David Shukman
Environment Correspondent, BBC News, Eureka, Canadian Arctic
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