Richard Paterson, master blender at Whyte and Mackay, whose company supplied the Mackinlay's whisky for Shackleton, described the find as "a gift from the heavens" for whisky lovers.

"If the contents can be confirmed, safely extracted and analysed, the original blend may be able to be replicated," he said.

"Given the original recipe no longer exists this may open a door into history."

Shackleton's expedition ran short of supplies on their long trek to the South Pole from Cape Royds in 1907-1909 and they eventually fell about 100 miles (160 kilometres) short of their goal.

No lives were lost, vindicating Shackleton's decision to turn back from the pole, first reached in 1911 by Norwegian explorer Roald Amundsen.

Shackleton's expedition sailed from Cape Royds hurriedly in 1909 as winter ice began forming in the sea, forcing them to leave some equipment and supplies -- including the whisky -- behind.

"I personally think they must have been left there by mistake, because it's hard to believe two crates would have been left under the hut without drinking them," Fastier said.