What doesn't make sense to me about an immersed? Tunnel is: "How can you link more than 2 sections of the tunnel at the same time? And if you can only link 2 sections at the same time does that mean you have to hire Scuba Divers to link them? And how deep is the water that they are diving into.
So, on the level I'm writing about it doesn't make any sense at all. However, if they are doing it robotically and mechanically I could see this might work. However, even then you cannot pour concrete to join the sections when it is deep in water. However, you might weld sections together I suppose. Then when all the sections are laid between the two landed areas then you would need some really amazing pumps to pump out all that water too maybe back into the ocean? And what about all the fish and aquatic life caught by accident in these buried sections before they are welded together or however you join more than two sections at a time underwater?
begin partial quote from:
https://www.cnn.com/travel/fehmarnbelt-tunnel-germany-denmark-europe/index.html
As an “immersed” tunnel, instead of being dug through solid land mass like the Channel Tunnel, the Fehmarnbelt is made using prefabricated concrete sections which are dropped into a trench dug on the seafloor, linked together, and then buried.
Last month, in February 2025, the first precast concrete tunnel sections, called elements, left the factory in Rødbyhavn, on the Danish side of the tunnel, completing Part One of a groundbreaking journey from land to sea that is scheduled for completion in 2029.
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