Greenpeace crew use a helicopter to move a boxed 'hot water drill' across sea ice, from the MY Arctic Sunrise. The drill is used to make holes through the floe in order to assess ice thickness and to fix instruments into the floe. Polar oceanographer Dr Peter Wadhams, from the University of Cambridge, leads an independent team of five scientists. The scientists are working with the Greenpeace crew, researching the effects of climate change on fast depleting sea ice.