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A long-secret network of tunnels 100 feet below the streets of London could be the city’s next big tourist destination ...
The tunnels lie directly below London Underground’s Central Line in the city’s Holborn area. Work to dig them began in secret in 1940, when Britain feared invasion by Nazi Germany.
The tunnels lie directly below London Underground’s Central Line in the city’s Holborn area. Work to dig them began in secret in 1940, when Britain feared invasion by Nazi Germany.