Humber Gas Tunnel

The Humber Gas Tunnel is a natural gas-carrying pipeline that runs underneath the Humber Estuary between Paull in the East Riding of Yorkshire, and Goxhill in Lincolnshire, England. The project was started in April 2018, and the pipeline was used to transport gas for the first time in December 2020. It is designed to carry 20% of the gas used in the United Kingdom, and is a crucial feeder pipeline to carry gas to the south of England. It is the longest pipe in a tunnel in Europe, and due to being inserted into the tunnel that was deliberately flooded with water, it is the longest hydraulically inserted gas pipeline in the world.

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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