Drakelow Tunnels

Drakelow Tunnels are an underground former military complex beneath the Blakeshall Estate north of Kidderminster, Worcestershire, covering 285,000 sq ft (26, 500 m2), with a total length of around 3.5 miles (5.6 km). They were originally built as a Second World War shadow factory, and were developed during the Cold War to be a fall-back government centre.

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Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).

Other tunnels in United Kingdom

Delaware Aqueduct United States · 137 km Päijänne Water Tunnel Finland · 120 km Orange–Fish River Tunnel South Africa · 82.8 km Ishikawa Tunnel Japan · 78.5 km Brenner Base Tunnel Austria · 64 km Mont d'Ambin base tunnel France · 57.5 km Gotthard Base Tunnel Switzerland · 57.09 km Hong Kong–Zhuhai–Macau Bridge China · 55 km