Makers of a new BBC documentary about the coronation and crown jewels revealed that the precious gems were hidden in a biscuit tin buried in the grounds of Windsor Castle in case of a Nazi invasion.
The filmmakers, Alastair Bruce and Anthony Geffin, explained that to prevent the jewels falling into German hands, they carefully chose hiding places around the castle in which to hide them.
They said: "The King, George the Sixth, made huge efforts to make sure the jewels were safe and they were brought to Windsor, special holes were dug in...the ancient castle and they were hidden there! And they had to be so careful."
Filming the St Edward's Crown proved difficult as the BBC could not take shots from above.
The filmmakers explained:"We were lining up for the St Edward's Crown and they said 'we're sorry but you can't shoot anywhere above the Crown because only God is above the Crown', so we had to quickly shift the cameras so we could get the correct shot."
Alastair Bruce, who interviewed the Queen, spoke of what it was like to reunite her with the crown in which she was coronated.
He said: "The Queen had never seen it, she'd never touched it since and it was quite amazing to see her reach forward and feel the weight of it because it weighed five pounds, it was made for the bewigged head of Charles II.
"Just imagine as a 27 year old woman, if you line up 2 bags of 2 pounds of sugar and an extra half bag it's particularly challenging."
He also spoke of how interviewing her was different to getting answers off other subjects - as he was not allowed to ask her direct questions.
Mr Bruce explained: "You pose a point and then the Queen sometimes responds and then conversation sometimes follows from there. But no, posing direct questions was not on the cards. This was a conversation with the Queen."
The Queen previously spoke of the dangers of wearing a crown: “Yes, fortunately my father and I have about the same sort of shaped head. But once you put it on it stays. I mean it just remains on.”
The discreet alteration to the Crown saw its arches lowered to create a smaller, more feminine object for the then-27-year-old Queen.
“You have to keep your head very still,” Bruce remarked, as the pair examined the Imperial State Crown and watched footage of the 1953 day.
“Yes,” the Queen agreed. “And you can’t look down to read the speech you have to take the speech up.
“Because if you did your neck would break, it would fall off.
“So there are some disadvantages to crowns, but otherwise they’re quite important things