St Helena Tunnel

The St Helena Tunnel is a twin-tube road tunnel that forms part of the Pacific Highway near Byron Bay, New South Wales, Australia. The 434-metre-long (1, 424 ft) tunnel under St Helena Hill in the locality of Ewingsdale was built as part of the 17-kilometre (11 mi) Tintenbar to Ewingsdale upgrade, which involved a new alignment of the highway.

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

Other tunnels in Australia

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