How the Fehmarnbelt Tunnel is being built

The Fehmarnbelt tunnel between Rødbyhavn on Lolland and Puttgarden in Germany will be the world's longest immersed tunnel. This video explains how 360,000 tonnes of steel and 3 million cubic metres of concrete are being turned into an 18-kilometre tunnel.

[anushkachathuranga]

What a great project..willing to join with this 😊

[mmicoski]

Comparing this to Eurotunnel, I really don't know which one is more insane. To dig a dry cave under meters of soil under meters of water, trusting you will be able to handle the structural instabilities, or to transport and install a flat structure in a trench prepared under the water, made smooth enough to don't produce structural stress on the tons that will compress it...

[ProfessorChomsky]

Absolutely outstanding. It's amazing what humanity can achieve yet we still waste and ruin things on war. Just imagine how much more we could do.

[wayneosaur]

How do they get the bulkheads out after the water is removed? I was waiting to see that...

[nizarkhrisat]

Really this is amazing and very creative...this will be written in history like the pharaonic pyramids

[konradmanko]

Very impressive! Looking forward to cross that tunnel some day.

[KSarah]

It looks simple. I'll try it at home.

[ZMacZ]

I really do hope they make the seals between the elements re-expandable.
No matter what you do, there wll always be some movement after the elements
are placed, and so these seals should be at least minimally flexible,
with the ability to contract and expand.
Also, a mechanism for forced contraction would be a neccesity as well.

Once trucks and other heavies start moving through the tunnel, it will
sink into the soil a little at least, and thus from the start of the tunnel you need
a little extra to compensate for any such motion, which will happen
over several miles, and thus yield significant differences in length of said distance,
which may be as high 1 meter difference on each end.
If the forced contraction mechanism also has a tensile gauge, they can check
for motion by checking the tensile gauges. If they change there's motion,
if not, no motion.
They can either use a cable system that allows the pieces to simply
press into each other, no matter the motion, or have each piece hook
into the next and pulling that in.
I calculated roughly 2cm by temperature differences alone for each piece,
which happens at least yearly, but to a smaller degree daily.
I'd add at least one more piece on both ends, to compensate for yearly
sinking, or at least a part of a piece, like 10 meters long.
As the gap widens, these pieces can fill the gap, while the gaps
they themselves leave can be filled with regular concrete, since this would be on dry land.

[dimasmahendra]

sangat informatif, terimakasih atas pemaparannya dan mudah dimengerti

[trollingisasport]

This video is giving me tunnel vision.

[danish]

I don't understand how do they connect the tunnel sections . Is it just a matter of screwing thousands of thick bolts with a seemingly thick incorrosive gasket between them ?!!! Only a detailed animation will make me comprehend .

[mantasr]

How did they level out the seabed?
What a huge undertaking....

[tomsky]

Iraq have similar project of immersed tunnel with 2.5km long, 34m beneath the surface, 4 motorways lane for each side. Expecting to be done by 2025, the cost of the project is 86$ million.

[frwy]

Concrete is not eternal... How this tunnel's structure will the maintained once the elements will be underwater and covered by rocks and sand ?

[lemee]

Who is the narrator of this video clip?

[rppacademic]

217m x 9m x 40m = 78.120 cbm weight: 73.000 t ? That would be a ship?

[mmicoski]

The ocean is rising and they keep putting more and more structures under water...

[JorgeffAzevedo]

Will there be a gas station in the middle of the tunnel?! Maybe with a nice panoramic glass above to see the fishes and to eat my schnitzel in a proper environment! 😁

[AlessandroMarani]

What about ventilation? Emergency exists if there's a car accident? What if the sea level moves, earthquakes, etc. A ton of questions unanswered...

[TZ]

What happens to the factory and dock? So fascinating, I know my 2030 vacation destination!