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Tunnels

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Construction of the Fehmarnbelt Tunnel, the world's longest immersed tunnel, showing large concrete sections being lowered into the sea by heavy machinery.
Cosmos & Physics

Fehmarnbelt Tunnel: World's Longest Immersed Tunnel

Norway's Rogfast tunnel is set to plunge 390 meters below sea level and stretch 26.

Dr. Evelyn Reed·June 23, 2026