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.

[@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...

[@Inkyminkyzizwoz]

I was just wondering whether a second Channel Tunnel could ever happen, and if so whether this method could possibly be viable, given how the current one is quite twisty due to the TBMs having to stay within the chalk belt. It seems as though immersion might allow it to be straighter

[@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.

[@konradmanko2303]

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

[@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.

[@anarossi1860]

I was thinking the same..i hope they will consider this.

[@maroltma18]

They use a Gina-seal first, an omega-seal from the inside and concrete to seal it off

[@ZMacZ]

@@maroltma18 No matter what seals they use, it always needs to be flexible. It's not like underground tunneling, where a little unwanted stretch leaves a small gap that can be easily filled. Underwater, water will not hold it's place. Concrete will not stretch, it will break when stressed by tensile strength.

[@maroltma18]

​@@ZMacZ this is exactly what the gina and omega seals are designed for. They allow the elements to be flexible even when earthquakes accure. The concrete is just used to cover it up as far as i know.

[@maroltma18]

+ the tunnel is burried underneath the seabed aswell as shown in the video. It doesn't take the whole stress away of course but it does keep it in place much better. It's not a completely new concept by the way. It works already

[@anushkachathuranga7646]

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

[@whatisheartscont2be645]

Very cool project.

[@ianlabrum2013]

Just more damage to our planet,not the government nor councils ours,who really gives a shit gor another tunnel,whoopee look more damage to our planet,lets hope it collapses an kills the entire lot in the tunnel,our greed will never stop until there's no reverse of what we av allowed

[@wayneosaur]

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

[@SWGINSPECTOR]

Not sure if it's what they will do but it seems like you could just dismantle them and remove them from inside the tunnel.

[@abidaliqasim1209]

I have the same question.. .no video show how they remove it ..

[@adrianthoroughgood1191]

I thought they rather glossed over joining the segments together. Just push them together and the water pressure stops any leaks. Seems very sus to me.

[@dianne6399]

@@adrianthoroughgood1191 I was wondering the same thing. Found info about seals that will be used.

[@pickyourteethup]

The first car has to go really fast

[@AlessandroMarani72]

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

[@karl7428]

We dont have earthquakes of any significance in Denmark. I assume the technical tunnel will be used as an emergency exit. We already have a similar tunnel connecting Sweden and Denmark 👍

[@Draytsn]

Emergency exit is the maintenance tube. Same as the other tunnels that have been built.

[@oriol108]

Can a segment will be able to be closed in case of water filtrations or fire ?

[@frwy1]

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

[@trollingisasport]

This video is giving me tunnel vision.

[@111danish111]

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 .

[@tomsky7464]

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.

[@nizarkhrisat6194]

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

[@mmicoski]

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

[@mantasr]

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

[@toothpastehombre]

Dredge ships

[@yiannimil1]

bobcats

[@TheM16fan]

With the sdt. Not featured in this video.

[@1KSarah]

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

[@jan_Mamu]

i did it as a school project

[@dimasmahendra4689]

sangat informatif, terimakasih atas pemaparannya dan mudah dimengerti

[@7absinth]

And water level in the sea increases by 1km and another island will disappear in the world.

[@mohamadbelal268]

Great work

[@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! 😁

[@Nobinobli]

😂 you don’t have time for that 7-10 min

[@gunnar6674]

@@Nobinobli Yeah, you have just enough time on the ferry to have dinner. I took the train before, and I liked the ferry. Will the ferry remain for transporting things which can't go in the tunnel?

[@jappedut9009]

😂😂😂❤

[@maximme]

big thanks to China for inspiring mega infrastructure projects like this. Lets hope Europe can pull this off within our live time.

[@foooooob]

2029 ??? I´m wondering why did they wait so long to make this obvious connection between central europe and Scandinavia. There´s only one ferry line which is called Scandiline which has always enabled to cross Rodby to puttgarden so far. Scandalous and very expensive.

[@lemee70]

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?

[@84TZ]

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

[@ncard00]

They will remain, and be used for other projects, like the second ficed link from Denmark to Sweden when it gets built.

[@jimothypersson8306]

@@ncard00 which one is this? helsingør - helsingborg?

[@274pacific]

Anyone else get XCOM vibes from the tunnel factory?

[@AntunesDalsgaard]

In the very last clip, why do you show only one train track? The elements have two train tubes.

[@lenczo9490]

why you so tosic man?

[@tomwessmann4181]

The events of the past few weeks have given me food for thought. After Nord Stream and Crimean Bridge one can probably say that a bridge would be much safer. An act of terrorism like the one on the Crimean Bridge would cause a massive catastrophe in a tunnel, even if there were no flooding. The blast would rush through the entire tunnel and cause immense destruction.

[@ramons.oliveira2176]

Parabéns ...

[@sv9141]

I think I hate the word "element" now. Switch it up from time to time throughout the video! lol

[@poderosothor5571]

Loucura .... mesmo havendo uma tecnologia formidável, em algum momento haverá tragédia

[@PaulBateman69]

You guys think 2029 will be there human on earth!

[@_loss_]

yes

[@ncard00]

Yes, if we build tunnels like this all over the world only for high speed trains and freight trains and ban planes and cars, everybody becomes vegan, and we all use nuclear power.

[@SarahFick-cn8to]

Actually, I'm wondering as well. - but I'm pretty sure I will be gone by then - I'm 88years old!!!!

[@Oslohiker]

I am looking forward to not have to use the heavily over-priced ferry. I hope they can finish earlier....

[@ryen3k]

But how much will the tunnel cost to travel in?

[@x1hivf]

@@ryen3k about 1/3 of the ferries

[@ΟΟύτις]

@@x1hivf Are you sure; Because in Greece we had a ferry for Rio-Antirion and the cost was 4 euro.The bridge is 13.80.Also we had a small ferry in Aktio-Preveza and the cost was 1 euro.The underwater tunel is 3 euros for about 3 kilometres.

[@x1hivf]

@@ΟΟύτις a one way ticket with the ferries on this route today is around 95 euro pr. person

[@ΟΟύτις]

@@x1hivf 95 euro for 18km!! Very expensive!From Piraeus port to Crete its about 50 euro but is more than 150km.

[@surfarandrewboy]

DK: Jeg glæder mig til at gå gennem tunnelen, i stedet for båden SWE: Jag ser fram emot att få åka genom tunneln, istället för båten ENG: I look forward to going through the tunnel, instead of the boat GER: Ich freue mich darauf, durch den Tunnel zu gehen, anstatt durch das Boot

[@mullervolker9814]

Durch den Tunnel gehen? Walk through the tunnel? Du köre gennem tunnelen. Du fährst durch den Tunnel. You drive through the tunnel. Jeg glaeder mig til at köre gennem tunnelen ogso

[@JamesAllmond]

@@mullervolker9814 18 km, I hope so! ;-)

[@richardmartin773]

Jag också

[@cwat7319]

AMAZING!

[@richardmartin773]

if only this could be done between sweden and åland

[@_loss_]

Hell no, bro. The ferry lobby wont let it happen.

[@ncard00]

It can with money

[@ncard00]

@@_loss_ ban monopoly’s like that, build a tunnel instead, so much faster and climate friendly than ferries.

[@Inkyminkyzizwoz]

​@@ncard00*monopolies

[@jappedut9009]

What about border control ❓

[@williamn3070]

Very little needed since Denmark and Germany are in the EU and Schengen area.

[@PhamvanDong]

One of the most controversial projects on this planet if you ask me. The amount of money this project will cost is ridiculous. Especially when you consider the time saving/cost ratio, on an exceptionally traditional route that has been working fine all these years using the ferry. The money used here could have gone to other more urgent needs in society. Don't get me wrong, this project is truly the next level of outstanding engineering. But a vastly unnecessary one.

[@cethex]

You have no idea of how this will free up our transportation network, and actually save money on other road projects. Besides that you dont factor in the labour created. Nor the fact that it will not be free to travel the tunnel, and like our Storebælts bridge, the money will get back.

[@nawwk79]

Next project: Tunnel from New York to London.

[@GT-jh3hn]

haha, definetly not possible

[@ncard00]

@@GT-jh3hn It is possible, just very expensive.

[@ΟΟύτις]

@@ncard00 Atlantic Ocean is very deep for a project like this.

[@chickenpotpie43]

If it were to be done in segments, like the path of a non stop flight through Canada, Greenland, Iceland, and UK there would still be around several hundred miles underwater. The sea is closest to ground at those points. May be possible but would definitely be the most expensive protect ever and take maybe 100 years to complete so we wouldn't see it. Would be cool though.

[@ncard00]

Yes, make it happen, everything is possible, when you have the money.

[@DavidLopez-mh2tn]

Wow!!!

[@WILSONANTONIO]

uuuuuuuuuuaaaaaaaaauuuuuuu Topíssimo! Projeto bem audacioso...

[@trollingisasport]

IM A TUNNEL

[@DaAnderson-n8s]

Treutel Station

[@chinhbccable]

totally amazing, but how do you ensure the security to prevent any terrorist?

[@YaroslaffFedin]

How do you ensure security in regular tunnels? On bridges? In buildings? Terrorism is asymmetrical warfare, and can not be prevented

[@ncard00]

@@_monti142 Prevent it by limiting the availability of weapons to only the military and the police, the united states are insane allowing everyone to carry weapons, I would never feel safe, and for the police, the smallest assignments can turn in to life and death. The americans could take over america like nothing at any time if they want, cause it’s 100’s of millions of people with guns against thousands of policemen, or the military would have to kill the entire population, and if people had used their firearms during the storm at the congress… you would have had to blow up the entire building!

[@antonhelsgaun]

Mostly by making the tunnel walls thick enough to resist a bomb blast i guess

[@CraigMclerran-f6p]

Ryan Bridge

[@andreasmartin7942]

Switched the sound off, played this instead: kzbin.info/www/bejne/jJKVamqbp6-dgJY ...oddly satisfying 😁

[@craigr.h.laurent240]

Why does "FemernAS" believe that background "music" is needed while the narrator is speaking. That makes no sense.

[@ClariceJoyce-b7n]

Marielle Pike

[@o_egonos_tu_psili]

👌

[@TheresaWinters-z4w]

Ubaldo Manors

[@archstanton5973]

Fehmarn is NOT the "largest". The ShenZhong Link in Guangdong southern China has immersed tunnels that are over 70 meters wide while the Fehmarn tunnels are 40 meters wide.

[@ΟΟύτις]

They mean longest.

[@SirMangoMantango]

Largest would be volume, and the ShenZhong link tunnel is only 5,25km while this is 18km, so Fehmarn is still the largest by volume.

[@matwu1669]

Pracuje tu mam 15 tys na reke duzo polakow

[@dianne6399]

In case anyone else is wondering how they actually seal the pieces together: kzbin.info/www/bejne/aInOqqyZbrWfh6M

[@jacknath1]

Thank you Dianne. A lotore detail.

[@eonbriz3360]

Just immerse only ..that is genius.. and one of the sign of the end of the world...

[@sub-harmonik]

.. what?

[@alfawzbenben4310]

علامة الساعة، ههههه

[@p.nguyen8136]

take your pills, please.

[@oskarzientek5646]

robi wrazenie

[@MarkaBrown-c5k]

Cummings Prairie

[@alammd4673]

😛

[@Shu77el3c0ck]

Bro (danish) = bridge (english) hahah calling your bro a bridge GG

[@7absinth]

And water level in the sea increases by 1km and another island will disappear in the world.

[@dianne6399]

In case anyone else is wondering how they actually seal the pieces together: kzbin.info/www/bejne/aInOqqyZbrWfh6M

[@MattAukerman]

I was literally thinking "how do those pieces stay together" and saw this comment not even a second later 😂 - thank you!