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It's 100 years to the day since Antarctic explorer Ernest Shackleton set out on his final expedition.

Leaving London through Tower Bridge, and hailed by a large crowd, his intention was to map still uncharted coastal regions of the White Continent.

But he never managed it, dying of a heart attack before reaching the polar south at the island of South Georgia.

To mark Shackleton's passing, the (SGHT) is mounting a special exhibition.

It tells the story of that final expedition, which continued without him, and includes some fascinating archive material recalling his death and burial at the British Overseas Territory.

You can see, for example, the banners that were walked in front of Shackleton's coffin, and the wooden cross that was erected atop the memorial cairn built by his crewmen.

Some of the artefacts have not been seen publicly before, or at least haven't been seen in their proper context. And some objects have been loaned from other museums.

, but eventually the physical items will be moved to the museum at Grytviken on South Georgia, which attracts a lot of tourists who are drawn to the island's spectacular scenery and wildlife.

Covid difficulties mean the artefacts won't be in place for the 100th anniversary of the explorer's death on 5 January, but this actually presents an opportunity says Jayne Pierce, the SGHT's museum curator.

"The good thing about the exhibition being online is that anyone can see it. Shackleton has a lot of super fans who never would be able to get to South Georgia, and this way they can see what we've put together," she told ´óÏó´«Ã½ News.

The 17 September, 1921, departure from St Katherine Dock was the beginning of what turned out to be - literally - Shackleton's "last quest".

"Quest" was the name of the ship in which his team would travel south.

A Norwegian sealer, the vessel was converted for the purpose and was fitted with a crow's nest to aid navigation through sea-ice and to look out for hazards such as big icebergs.

That crow's nest - not much more than a simple barrel - still exists and has been included in the exhibition. It's been scanned so that visitors can turn it around online.

"When we started looking at what to do to mark Shackleton's death, we thought we should expand the exhibition to also tell the story of the expedition, even though it wasn't that remarkable and he himself never actually carried it through," explained Jayne Pierce.

"But the Quest expedition is still important because it represented his last big push in life. He was desperate to go, and it was almost as if he knew his time was limited."

The Quest expedition (more properly called the Shackleton-Rowett Expedition) was the explorer's fourth Antarctic venture. He's most famous, of course, for his third - the ill-fated Imperial Trans-Antarctic Expedition, 1914-1917.

Trapped in sea-ice for over 10 months, his Endurance ship drifted around the Weddell Sea until ultimately it was crushed by the floes and dropped to the deep. How Shackleton and his men then made their escape on foot and in lifeboats is the stuff of legend.

Shackleton "mega-fans" now visit South Georgia to retrace the final stages of the escape which saw him walk over the island's mountains to raise the alarm at the Stromness whaling station just along the coast from Grytviken.

"His ties to South Georgia are therefore deep," the curator said.

"After he died they tried to send his remains home but when they reached Montevideo, word reached his wife and she said 'no, he should be buried in South Georgia because that's where his true soul was'."

This turn of events was certainly unexpected for the crew of the Quest. After the death of "The Boss", they had continued on to Antarctica to conduct the planned mapping work, and so were surprised to find his grave at South Georgia when they came back through.

Asked to explain the enduring appeal of Shackleton, Jayne Pierce says it has something to do with the romance of the so-called "Heroic Age" of Antarctic exploration.

"I guess today technology makes everything so easy. We can go to space, we can go to the bottom of the ocean, we can go to the South Pole. But for Shackleton, these were all unknowns. They didn't have the technologies. And so for lots of people there's this romance to what Shackleton did and to the idea of the wilderness that doesn't really exist anymore."

Shackleton will be in the news early next year when another mission is mounted to try to find and photograph the wreck of the Endurance on the floor of the Weddell Sea.

The SGHT online exhibition can be found .

It is hoped that the exhibition at the South Georgia Museum can be opened at some point during the coming season or the next, depending on travel restrictions. The online exhibition can be found .