Orkney tunnel

The 51st longest tunnel in the world

15.3 km · Length

The Orkney tunnel is a suggested undersea road tunnel between Orkney and Caithness on the Scottish mainland. The expected length of it would be about 9–10 miles (15–16 km).

Wikipedia ↗

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