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The 1955–58 Commonwealth Trans-Antarctic Expedition (CTAE) was a Commonwealth-sponsored expedition that successfully completed the first overland crossing of Antarctica, via the South Pole. It was the first expedition to reach the South Pole overland for 46 years, preceded only by Amundsen's and Scott's respective parties in 1911 and 1912.

Preparations began in London in 1955. Over the austral summer of 1955–56 Fuchs sailed with an advance party from London to Antarctica in the Canadian sealer Theron, with the purpose of establishing Shackleton Base near Vahsel Bay on the Weddell Sea, from which the trans-Antarctic expedition would begin.