Built by eccentric philanthropist Joseph Williamson, a network of tunnels run under the city of Liverpool. Their true purpose is widely disputed and remains a mystery to this day.
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Derinkuyu (also known as Elengubu, Cappadocian Greek: ?a?a??p? Malakopi; Turkish: Derinkuyu Yeralti Sehri) is an ancient multi-level underground city near the modern town of Derinkuyu in Nevsehir Province, Turkey, extending to a depth of approximately 85 metres (280 ft).
But, there's a secret tunnel in East London that's even deeper than the Tube, and many Londoners don't know it exists. The Lee Tunnel, also known as the Stratford to East Ham deep tunnel, is 80 metres below the surface, and runs for 4.3 miles. This tunnel is rarely seen by people.
The longest tunnel in the United Kingdom is the Northern line at 27,800 metres (91,200 ft). This will be superseded in the 2020s by the 37,600-metre (123,400 ft) Woodsmith Mine Tunnel in North Yorkshire that will transport polyhalite from North Yorkshire to a port on Teesside.
The Tunnel is a guerrilla-style film blending real-life politics – a local government plan to recycle underground water – with a fictitious cover-up. It follows an ambitious news crew deep inside a labyrinth of disused train tunnels beneath central Sydney.