In 1941, the Combined Operations base which was responsible for defending the Western Approaches from German attack during World War II, was moved to Derby House in Liverpool.
The complex – which was known locally as the “Citadel” or “Fortress” – was to become the Operations Room. It was designed to be bomb proof and gas proof, with a 7-foot thick roof and 3-foot thick walls, and 100 rooms covering an area of 50,000 square feet.
Today, the historical war time bunker has been restored and opened to the public as The Liverpool War Museum. A memorial to those who died, it is the original building where the battle was fought and won. It has been reconstructed exactly how it used to be. The Western Approaches Museum is open from 10.30am to 16.30pm, every day except Friday and Sunday.