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Pictured: An invitation to Sir Ernest Shackleton's memorial service.<br />
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An unseen archive belonging to the captain of Sir Ernest Shackleton's ill-fated expedition to Antarctica has emerged a century later. <br />
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Frank Worsley commanded the Endurance during the famous adventurer's disastrous voyage when the crew became stranded for 18 months in freezing conditions. <br />
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The vessel became trapped in pack ice and eventually disintegrated in October 1915 - 10 months after it arrived in Antarctica. <br />
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After months spent in makeshift camps as the ice drifted northwards, Worsley led the crew in lifeboats to the inhospitable and uninhabited Elephant Island.