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Bedmap3 is the most fine-grain map to date of the landscape beneath Antarctica's ice. Scientists created it using more than 60 years' worth of data from satellites, ships and dog-drawn sleds.

The place thought to have had the thickest overlying ice was Astrolabe Basin, in Adélie Land, but a reinterpretation of data reveals it is in fact an unnamed canyon - at 76.052°S, 118.378°E in Wilkes Land, where the ice here is 4,757m thick, which is more than 15 times the height of the UK's tallest skyscraper, the Shard in London.