Galleries of Mount Soratte
The Soratte Bunker is an air raid shelter located under Monte Soratte at Tiber Valley near Rome, Italy.
Tunnel data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).
Other tunnels in Italy
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