The Catlin Arctic team leader, Ann Daniels, and her colleagues, Martin Hartley and Charlie Paton, completed their survey work at the North Pole by taking their last samples through a hole at the pole they manually drilled through the floating sea ice.
The team has been collecting water and marine life samples from beneath the floating sea ice as part of the expedition's leading edge science program, which is assessing the impact of carbon dioxide absorbtion on the ocean and its marine life -- a process known as ocean acidification.
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