India's Brahmaputra Tunnel Project: Following 7 Iconic Underwater Tunnels from Britain to Turkey
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World's Deepest Underwater Tunnels: From Japan to Turkey, India to Build Brahmaputra Tunnel
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News18•23-02-2026, 21:33
World's Deepest Underwater Tunnels: From Japan to Turkey, India to Build Brahmaputra Tunnel
•Seikan Tunnel (Japan): World's longest underwater railway tunnel (53.85 km total, 23 km underwater), connecting Honshu and Hokkaido, suitable for bullet trains.
•Channel Tunnel (UK and France): Also known as 'Eurotunnel', 50.45 km total, 37.9 km underwater, vital for European trade and tourism.
•Marmaray Tunnel (Turkey): One of the world's deepest 'immersed tube' tunnels, connecting Asia and Europe beneath the Bosphorus, earthquake-resistant.
•Ryfast Tunnel (Norway): World's deepest underwater road tunnel (292 meters below sea level), 14.3 km long, connecting Stavanger to Ryfylke.
•Hong Kong-Zhuhai-Macau Bridge Tunnel (China): World's longest 'bridge-cum-tunnel' system (55 km total), includes a 6.7 km underwater tunnel, reducing travel time.
