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Explorers and researchers, battling freezing temperatures, have located one of the greatest undiscovered shipwrecks.
The Endurance, the lost vessel of Antarctic explorer Sir Ernest Shackleton, was found three kilometres deep into the Weddell Sea.
The ship was crushed by sea-ice and sank in 1915, forcing Shackleton and his men to make an astonishing escape on foot and in small boats.
Dan Snow, a historian who was on board the expedition spoke to Corin Dann.