Kampong Java Tunnel

The Central Expressway (CTE) is a major expressway in Singapore connecting the city centre with northern residential towns including Toa Payoh, Bishan and Ang Mo Kio, before linking to the Seletar Expressway (SLE) and Tampines Expressway (TPE).

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

Other tunnels in Singapore

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