As the longest-reigning living monarch, Queen Elizabeth II has seen a lot of changes during her 55 year reign.
While most people can’t imagine a time where she isn’t around, there’s a special group of people who have long been preparing for her death.
But before you get alarmed, it’s not some undercover plot. It’s actually their job..
An article published in The Guardian yesterday broke the news of Operation London Bridge, the top secret plan that will be implemented in the days after the Queen passes away.
The article leaks the (now previously) secret codeword that will be used to inform the first few people of her death - and we're already in tears.
The phrase? "London Bridge is Down".
Listen: The Crown, Netflix's drama of Queen Elizabeth's early days is a must-watch. Post continues after audio.
The first person to say it will be Sir Christopher Geidt, the Queen's private secretary who will contact the Prime Minister and say the codeword on secure lines.
The news will then be sent from the Foreign Office's Global Response Centre to the 15 governments outside of the United Kingdom (including Australia) where the Queen is also the head of state as well as 36 other nations of the Commonwealth.
The last time a British monarch died was George VI 65 years ago. The code word used to spread the message was "Hyde Park Corner" to prevent switchboard operators from finding out.
Even in the digital age, it is hoped that the news will be controlled or kept secret for some time before it is made public.