A free-swimming robot submarine maneuvers beneath sea ice in Eastern Antarctica in this undated photo made available on Oct. 11, 2012. Scientists have produced the first three dimensional map of the surface beneath Antarctic sea ice, helping them better understand the impact of climate change on Antarctica. The team of scientists from eight countries has used a robot submarine to chart a frozen and inverted world of mountains and valleys, allowing accurate measurements of the crucial thickness of Antarctic sea ice.
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