Short answer twice. Long answer: He went once as part of Scott's team, but was sent home after getting sick on an expedition. He later went back himself as the leader of an expedition to be the first to walk from one side of the Antarctic to the other, but didnt achieve it.
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he dicovered that he was not first to reach the south pole.
Shackleton's first challenge was the ship breaking. It broke and he had to race against time to take everything out. The cold weather was another challenge. On one attempt to reach the South Pole in 1908, all of his ponies died and there were heavy storms. On a second attempt to reach the South Pole in 1914, his ship was crushed by pack ice, forcing the expedition to walk 1,200 km to South Georgia. Five months later they were rescued by a Chilean warship. On a third attempt to reach the South Pole in 1921, Shackleton died from a heart condition.
Ernest Henry Shackleton (1874-1922) was a British explorer who commanded three expeditions to the Antarctic (1907-09, 1914-17, 1921-22), during which the South Magnetic Pole was located in 1909.
90 Degrees.
The South Pole was discovered by explorers on December 14, 1911, by a Norwegian explorer named Roald Amundsen.