Deep below in central London's Holborn area lies a 16-km long tunnel system that served as a lifeline during World War II. These tunnels, which were hand-dug in the 1940s, protected Londoners from German bombing raids during the Blitz. After the air raids ended in 1942, the tunnels were abandoned, preserving their wartime history for decades.
About 100 feet underground, the London World War 2 tunnels are filled with old equipment like rusting generators, pipes, and electrical systems. The walls are still covered with wires, switches, and control panels from the 1950s and 60s when around 200 workers used the space as a telephone exchange centre.