Commonwealth Trans-Antarctic Expedition

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.

In keeping with the tradition of polar expeditions of the "heroic age" the CTAE was a private venture, though it was supported by the governments of the United Kingdom, New Zealand, United States, Australia and South Africa, as well as many corporate and individual donations, under the patronage of Queen Elizabeth II. It was headed by British explorer Dr Vivian Fuchs, with New Zealander Sir Edmund Hillary leading the New Zealand Ross Sea Support team. The New Zealand party included scientists participating in International Geophysical Year (IGY) research while the UK IGY team were separately based at Halley Bay.

Fuchs was knighted for his accomplishment. The second overland crossing of the continent did not occur until 1981, during the Transglobe Expedition led by Ranulph Fiennes.

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. The Theron, like its immediate forebears, the Endurance (1914 Shackleton's Imperial Trans-Antarctic Expedition) and the Deutschland (Filchner's German Trans-Antarctic Expedition of 1911), was trapped in the ice. Despite sustaining considerable damage, she was able to free herself with the help of the Auster Antarctic floatplane that scouted a way out. In early 1956 Fuchs sailed back to London, leaving eight men to over-winter at Shackleton.

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