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Queen Elizabeth II, Great Britain’s longest-serving monarch, died Thursday at her Balmoral estate in Scotland — putting in motion a special plan for memorial events dubbed “Operation Unicorn.”

What happens under Operation Unicorn?

With the Queen’s passing at her beloved Balmoral, her body will be taken via royal train to Edinburgh where she will rest in state at the Palace of Holyroodhouse, the Mirror reported.

Her coffin will then be taken to St Giles’ Cathedral, also in Edinburgh, for a brief period.

Holyroodhouse and St Giles’ Cathedral are expected to be the main sites where mourners can pay their respects in Scotland.

Under the plans, the late monarch’s coffin will then make a final, five-hour journey back to London on the royal train.

After returning to the capital, the Queen’s body will be taken to the throne room of Buckingham Palace.

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A screenshot of the British Monarchy's official website, announcing the death of Queen Elizabeth II.
The official website of the British Monarchy announced the death of Queen Elizabeth II on Sept. 8.
Officials placed the announcement of the death of Queen Elizabeth II on a fence outside the Palace of Holyroodhouse.
Officials placed the announcement of the death of Queen Elizabeth II on a fence outside the Palace of Holyroodhouse, Holyrood, Edinburgh, Scotland, Britain. REUTERS
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  Queen Elizabeth was surrounded by family members during her final hours. POOL/AFP via Getty Images Queen Elizabeth was surrounded by family members during her final hours. POOL/AFP via Getty Images

How this changes Operation London Bridge

Operation London Bridge is the all-hands protocol that is in place if the Queen is to die in London and set in motion a 10-day mourning period ahead of her funeral.

After the initial events of Operation Unicorn are carried out and the Queen’s body arrives back in London from Scotland, Operation London Bridge will proceed, according to leaked details reported by Politico and the Guardian in recent years.


  Members of the public file past the coffin of Britain’s Queen Elizabeth I, the Queen Mother, as she lies in state in Westminster Hall, London, in April 2002. AP Members of the public file past the coffin of Britain’s Queen Elizabeth I, the Queen Mother, as she lies in state in Westminster Hall, London, in April 2002. AP

  A service for the queen will be held at Westminster Hall.
 A service for the queen will be held at Westminster Hall.

  Queen Elizabeth II of England at Balmoral Castle with one of her Corgis in 1952. Bettmann Archive Queen Elizabeth II of England at Balmoral Castle with one of her Corgis in 1952. Bettmann Archive

The London Bridge plan will see the Queen’s coffin rest at Buckingham Palace for three days before a procession through London to the Palace of Westminster, where Parliament sits.

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A photo of Queen Elizabeth stepping out of the Royal Train at Bristol Cathedral.
“Operation Unicorn” has been put into motion following the death of Queen Elizabeth II. Tim Graham Photo Library via Get
Queen Elizabeth II and her husband Prince Philip, Duke of Edinburgh, with their children Princess Anne, Prince Charles (right) and Prince Andrew on his first holiday to Balmoral in 1960.
Queen Elizabeth II and her husband, Prince Philip with their children on Sept. 8th 1960. Mirrorpix via Getty Images
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A photo of Queen Elizabeth and King Consort Philip walking hand in hand.
Queen Elizabeth died just over a year after the death of her late husband, Prince Philip.AFP via Getty Images
A phot of the Union flag was lowered on Windsor Castle as a rainbow appeared in the sky.
The Union flag was lowered on Windsor Castle as a rainbow appeared in the sky after the news of Queen Elizabeth II’s passing. Getty Images
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A service will be held at Westminster Hall when the coffin arrives and the Queen will lie in state there for three additional days.

Under the plan, the Queen’s funeral would take place at Westminster Abbey 10 days after her death.


  The Palace of Holyroodhouse in Edinburgh raised a flag following the statement of the death of Queen Elizabeth II. REUTERS The Palace of Holyroodhouse in Edinburgh raised a flag following the statement of the death of Queen Elizabeth II. REUTERS

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