Later, the bunker facilities were significantly expanded, transforming them into a massive structure capable of accommodating up to 400 government officials.
Recently, journalists from the Daily Mail obtained images of the interiors of one of the most secretive bunkers from the Cold War era.
The photos reveal narrow corridors and cramped rooms, a kitchen, a medical bay, storage areas, a BBC recording studio, as well as large spaces where officials conducted their activities.
In the restrooms, numerous rolls of toilet paper remain, each stamped with "Property of the Government" on every sheet.