Page last updated at 17:34 GMT, Friday, 17 April 2009 18:34 UK

Drilling to measure ice thickness

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.

The technical failure of the team's radar means that they have had to resort to drilling into the ice to determine its thickness.

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