An incredible £4.5 billion tunnel stretches underneath London and you probably had no idea it was there. The Thames Tideway Tunnel is a deep-level ‘super sewer’ that spans 15 miles from Acton ...

LONDON: Once home to British spies and a secret long-distance telephone exchange, a little-known network of underground tunnels is located behind a blue door in a narrow London hallway.

A sprawling network of secret underground tunnels is being transformed into a major new London tourist attraction. Hidden 40m below the streets of the capital, the Kingsway Exchange Tunnels were ...