A trapdoor used to access the secret area at Windsor Castle, where the Queen spent her war years for safety, still exists today.
Speaking for the first time about her coronation 65 years ago, Queen Elizabeth II has revealed how uncomfortable she was riding in her golden carriage to the ceremony, and how wearing the Imperial State Crown risks "breaking your neck".
"The only word I can come up with is medicinal, like cough syrup", she said.
Bruce discusses the crown jewels with Queen Elizabeth in an exceptionally rare conversation recorded for television.
A new BBC documentary reveals the Crown Jewels were hidden in a cookie tin at Windsor Castle during World War II to protect them from the Nazis - and that Queen Elizabeth II, who was a teenager at the time, didn't know they were being kept there.
"Fortunately, my father and I have about the same sort of shaped head. It's so heavy", she said.
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"It's not meant for travelling in at all".
"I've seen one coronation [her father's in 1937] and been the recipient in the other, which is pretty remarkable".
The documentary also features informal footage taken behind the scenes, including images of son and heir Prince Charles, then aged four, and his younger sister Anne playing underneath the queen's long robe.
The Queen showed her sense of humour as she joked that looking down while wearing the Imperial State Crown - which weighs a staggering 2.8 lb. - could be fatal. "So there are some disadvantages to crowns, but otherwise, they're quite important things".
The documentary also revealed that numerous Crown Jewels were buried in a biscuit tin on the grounds of Windsor Castle during World War Two, to protect them from the Nazis - information that was so top-secret, the Queen herself only just found out about it.
"You can't look down". The Bath Oliver biscuit tin wasn't just stored on a shelf in the pantry at Buckingham Palace, like how your mom stored leftovers in old Country Crock tubs. The monarch has never given an interview.