Page last updated at 18:36 GMT, Thursday, 30 April 2009 19:36 UK

How to prepare an 'Arctic runway'

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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 - primarily now from drilling following the failure of a mobile radar unit - will help scientists better understand the changes taking place at the highest latitudes.

Here, Pen Hadow describes how to prepare a runway in the middle of the Arctic so that a re-supply plane can land.

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