Page last updated at 12:27 GMT, Friday, 24 April 2009 13:27 UK

Getting ready to sleep in the Arctic

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Polar explorers Pen Hadow, Ann Daniels and Martin Hartley are trekking across the Arctic, taking measurements of sea-ice thickness as they go.

The team hopes its data will help scientists better understand the changes taking place in the Arctic.

Living conditions are difficult with the freezing temperatures. Martin Hartley shows us how the team get ready to sleep in frozen sleeping bags.

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