The Fehmarnbelt Tunnel Will Surpass The Ăresund Tunnel As The World’s Longest Immersed Tunnel. Spanning 18 km And 40m BSL Under The Baltic Sea, It Connects Germany And Denmark Using Precast Segments Instead Of Tunnel Boring Machines. Completing In 2029 At ~$7 Billion, It Will Reduce Travel Times, Boost Trade, & Showcase Environmental Care.
The Worldâs Longest Immersed Tunnel Is Almost Builtâa $7 Billion Project Without a Tunnel Boring MachineWhat if the future of tunnels wasnât about digging? The Fehmarnbelt Tunnel, the worldâs largest immersed tunnel, is being built without a single tunnel boring machine. Instead, engineers are using a bold, unconventional method thatâs faster, more precise, and environmentally conscious. Stretching 18 kilometers beneath the Baltic Sea, this $7 billion project is set to transform travel and trade in Europe.
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