Queen Elizabeth II passed away after reigning for over seven decades. She was 96.

Buckingham Palace announced the monarch’s passing on Thursday, saying, “The Queen died peacefully at Balmoral this afternoon.”

No other details were given regarding the Queen and what happens next following the announcement of her death. The statement, however, refers to Prince Charles and Camilla Parker Bowles as “The King” and the “Queen Consort,” respectively, noting that they will remain at Balmoral until their “return to London tomorrow.”

Hours prior to the announcement, the Queen’s children, alongside Prince William and Prince Harry, traveled to the estate in Scotland. It came after concerns grew about her health, with Buckingham Palace revealing, earlier on Thursday, that the monarch’s doctors were “concerned” for her health and had recommended “she remains under medical supervision.”

The Mirror reported that plans in the event of the death of Queen Elizabeth II have been ready for some time. Although, they are said to change depending on the location of her death.

With the British Monarch passing away at Balmoral in Scotland, the list of plans is reportedly called “Operation Unicorn.” As claimed, under the said plan, she will be moved from the estate to Holyroodhouse in Edinburgh before traveling to London via train.

The outlet consequently noted, though, that if the monarch travels by air following her death, the operation will be known as “Operation Overstudy,” per the plans leaked to Politico in 2021.

Meanwhile, “Operation London Bridge” is reportedly the list of plans in the event of Queen Elizabeth II’s passing in London. It allegedly notes what will happen in the United Kingdom following the monarch’s death, according to People.

In the said operation, it is understood that the nation will go into a period of mourning in the next ten days following the royal’s death. It is also added that funeral arrangements will be made during this period.

The magazine continued that, under the reported plan, which Politico published in September 2021, the state funeral will take place at Westminster Abbey. As for the final resting place, it will reportedly be at the King George VI Memorial Chapel at Windsor Castle.

Insider released a similar report, detailing what would happen in the next few days following Queen Elizabeth II’s passing. It said that, behind closed doors, an Accession Council would take place at St. James’s Palace “to formally declare the successor,” Prince Charles.

The publication noted, though, that the council is not required to make the accession of the Heir Apparent “official.” As pointed out, the Prince of Wales will become the British Monarch from the moment of the Queen’s death.