A military bunker located near Edinburgh, Scotland, built during World War II as a nerve centre for the British government in the event of air attack. The bunker was designed to withstand a nuclear attack and was used for military operations and as a command centre. After the war, it was largely forgotten until its rediscovery in the 1990s.
The bunker was also known as Churchill's Secret Bunker, a nickname that reflects its role as a secure location for the British government during World War II.