• What do scientists do when they want to study something?They try to isolate it, right? Shackleton's crew was isolated from the world for almost two years.

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• Every crew member survived the harrowing ordeal - no hope of rescue from the outside world, months of polar darkness, stranded on ice-floes, surrounded by killer whales, shortages of food and water.

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• First-person accounts kept on the expedition document Shackleton's leadership strategies while their ordeal was happening.

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• While they were 100s of miles from land, on an ice-floe, with no hope of rescue, a crew-member wrote about Shackleton, “No matter what turns up, he is always ready to alter his plans and make fresh ones, and in the meantime laughs, jokes, and … keeps everyone’s spirits up.”

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• A Shackleton team member summed up the opinion of the Endurance crew on Shackleton, they regarded the boss as “the greatest leader on God’s earth, bar none.”

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• Sixty years after the crew returned to civilization, one of the last living members of the expedition was asked how they had survived. He answered in one word, “Shackleton.”

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• Against all odds, an abundance of photographs and film survived the expedition.