tunnel

With 3,500 tons and 15 meters in diameter, China already has the largest tunnel boring machine in the world for high-speed trains

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China has just introduced Jiaoping No.1, the world’s largest earth pressure balance (EPB) TBM designed specifically for high-speed railway tunnels. According to counted recently reported by the state broadcaster CGTN, it is a 3,500-ton colossus with an excavation diameter of 14.57 meters, capable of also using artificial intelligence to monitor, adjust and correct breakdowns while drilling underground, all under extreme underground conditions. We tell you everything. What exactly is it. An earth pressure balance tunnel boring machine is a type of machine that excavates the ground while supporting it at the same time. The rotating head (cutting head) tears off material from the front, which accumulates in a closed chamber just behind. This accumulated earth acts as a “plug” and compensates for the natural pressure of the soil and water, preventing the excavation face from collapsing or the surface land from sinking. For soft soils or urban areas, it is a widely used method and we have seen it other times, like in Madrid with ‘Mayrit’ for transform L11. Why size matters. The larger the tunnel, the more complex and heavier the equipment needed to excavate it, and the more difficult it is to keep such a large excavation face stable. The latest one presented in China is almost 15 meters in diameter and specializes in high-speed lines, so it exceeds a considerable technical ceiling. It is a diameter comparable to that of the largest Chinese underwater tunnel boring machines, like the Dinghaiwhich has an identical maximum excavation diameter (14.57 meters) for the Jintang underwater tunnel. What AI does. According to the media, Jiaoping No.1 incorporates AI to monitor drilling in real time, adjust parameters and detect failures autonomously. And it is something that we see more and more in machinery of this caliber, since in recent projects such as the yangtze river tunnel between Chongming and Taicang, the Linghang TBM employs, according to Interesting Engineeringan intelligent control system capable of automatically regulating pressure, anticipating ground conditions using data and self-guiding during progress. Independence of the West. As has happened in many other sectors, China has gone from depending almost completely on foreign technology to dominating the world market in just a few years. Until a decade ago, German and Japanese manufacturers controlled the vast majority of this market. The turning point came in 2017, when China presented its first domestically manufactured 15-meter class TBM. Today the situation is very different. And according to data from People’s Daily, Chinese-made tunnel boring machines They hold close to 70% of the global market. Behind these teams are usually large state groups such as China Railway Engineering Equipment Group (CREG), the largest manufacturer in the country, or China Railway Construction Heavy Industry. What is all this for? The ultimate goal of these machines is to allow high-speed trains to cross rivers, seas and mountains at 350 km/h inside tunnels, something that a decade ago was a much greater challenge. Projects like the Yangtze Undersea Tunnel seek to drastically cut travel times between large cities and boost the economy of entire regions. And a tunnel boring machine like the Jiaoping No.1 makes its way however it wants. Cover image | Modern China In Xataka | Spain and Morocco have been dreaming of a tunnel under the Strait for 40 years. The great enemy of the project is called Umbral de Camarinal

To move the cutting head of the ‘Monica’ tunnel boring machine, a 152-wheel truck was needed. It’s the key to Australia’s ‘water battery’

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Transporting a gigantic tunnel boring machine to the work point is no small feat, and Madrid has a few things to say about this. However, in Cooma, a small town in the Australian state of New South Wales, they seem to have gotten the hang of it. And the colossal piece of steel crossed its streets at a snail’s pace on a 152 wheel truck. The cargo was part of Snowy 2.0one of the largest energy storage projects in the world. What is it about?. The piece was the central block of the cutting head of the tunnel boring machine named Monica. According to Snowy Hydro, the public company behind the project, this component weighs more than 137 tons and measures seven meters wide. The head is the part that really matters in a tunnel boring machine, since it is the rotating disc that faces the rock and crushes it as it moves. Media deployment. Monica’s head is too big to transport in one piece, so it had to be divided into five parts. Still, just moving the center block required months of preparation. The entire transport reached 73 meters in length, and was moved at night facing the last stretch along the Snowy Mountains Highway, heading to the Marica site, north of Kiandra, where the machine would be assembled. A colossal engineering project. This move was just one piece of a much larger puzzle. The company indicates that in the previous weeks more than 140 large loads were delivered to Marica from the port of Port Kembla, south of Sydney. The tunnel boring machines do not arrive assembled, as they are transported in sections (head, drive system, shields, support platforms) and are assembled on site. In fact, last October, the transport of Monica’s motor system (a component about 207 tons and eight meters wide) brought more than 1,500 people to Cooma, in what Snowy Hydro called one of the largest loads ever transported by road in New South Wales. What is all this for? Snowy 2.0 is, in essence, a gigantic water battery. The project will connect the Tantangara and Talbingo reservoirs through some 27 kilometers of tunnels and an underground power station. The idea is to generate electricity by turbineing water when demand is high and, in times of surplus solar and wind energy, pump it back uphill for reuse. The company assures that it will have a capacity of 2,200 megawatts and enough stored energy to supply about three million homes for a week. Start-up. Last February, Snowy Hydro announced that Monica had been commissioned and would be responsible for excavating the section of the tunnel that crosses the Long Plain fault zone, a geologically complicated area. Designed by the German firm Herrenknecht, the machine advances at one end of the tunnel while another tunnel boring machine, Florence, does so at the opposite. The idea is that both are underground before being dismantled. For those dates the project exceeded 70% execution. Snowy 2.0 has not been without controversy with news of cost overruns and delays, and completion is now scheduled for December 2028. Images | Snowy Hydro In Xataka | Canada is going to debut the residential skyscraper with the most floors in all of North America: it has 12 sides and 351 meters high

China has found a giant “tunnel” to introduce its cars into Europe without Europe. And it is facing Spain

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In 2007, when Morocco inaugurated the port from Tangier Med off the Spanish coast, many saw it as an ambitious logistical gamble. Less than two decades later, that port has not only become the largest of the Mediterranean and Africabut has begun to surpass historic European giants like Algeciras in traffic. What seemed like a regional infrastructure ended up becoming one of the main commercial gateways to Europe. A half-open door to Europe. Europe has been trying for years reduce your dependency China’s industrial sector and, more recently, protect its manufacturers against the avalanche of electric vehicles from the Asian giant. The tariffs imposed by Brussels, in fact, respond precisely to that objective. However, I remembered the weekend the financial times that, while attention was focused on Chinese ports and factories in the country’s interior, Beijing began to build a much closer alternative: an industrial network located on the other side of the Strait of Gibraltar. The growing concern in Brussels does not arise because China is exporting more cars from its territory, but because it is transferring part of its production capacity to a country that enjoys privileged access to the European market. Map of the surroundings of Tangier, with Tanger Tech City (to the south), Tanger Automotive City and the port of Tangier Med Morocco as an industrial platform. It explained the means that the transformation is visible around Tangier and Kenitrawhere Chinese investments in tires, brakes, electronic components, battery materials and future gigafactories are multiplying. What is emerging are not simple isolated plants, but a supply chain increasingly complete capable of feeding the European electric car industry. Morocco offers practically everything you are looking for manufacturers: geographical proximity to Europe, competitive labor costs, renewable energy, tax advantages and an extensive network of trade agreements. For many Chinese companies, producing there is more attractive to continue manufacturing in China and then face the growing European trade barriers. The fear of Brussels. European concern does not lie solely in foreign investment. What is worrying is the possibility that Morocco will become in an indirect way so that products backed by Chinese capital, technology and subsidies enter Europe with much more favorable conditions. The European Commission already has detected cases in which components manufactured with Chinese financial support end up benefiting from preferential agreements. The challenge is to distinguish where it ends an authentic Moroccan industrialization and where a strategy designed to circumvent tariffs begins. Put another way, the more complex supply chains become, the more difficult it becomes to answer that question. Beijing’s geographical advantage. If you like, China too. has understood that geography can be as important as technology. Off the Spanish coast is a country connected by trade agreements with Europe and the United States, equipped of modern ports and increasingly integrated into global production chains. From the Chinese perspective, installing factories in Morocco does not mean abandoning Europe, but rather get even closer to her. Instead of shipping finished products from thousands of miles away, companies can manufacture components and vehicles a few hours of the main European markets. The strategy reduces costs, limits commercial risks and makes the application of protectionist measures difficult. A battle for European industry. What happens in Morocco reflects much broader economic competition. Europe tries to protect an industrial base that consider strategicas China looks for new ways to keep its huge manufacturing capacity running despite increasing Western restrictions. The result is that North Africa is becoming a space increasingly disputedwhere the interests of Brussels, Rabat and Beijing intersect. For Morocco, investments mean jobs, infrastructure and growth. For China, they represent a privileged platform next to the gateway to the European market. And for the European Union they constitute a uncomfortable question: If Chinese production can be installed just on the other side of the Mediterranean, to what extent are tariffs really capable of slowing its advance? Image | Adam Cle, The Spanish Monkey In Xataka | China and Europe do not trust each other when it comes to electric cars. And someone is taking advantage of it: Türkiye In Xataka | The Chinese auto industry is moving to colonize Africa and Latin America. Also to be your springboard

Spain and Morocco have been dreaming of a tunnel under the Strait for 40 years. The great enemy of the project is called Umbral de Camarinal

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Linking Europe with Africa from the Strait of Gibraltar has been discussed for decades. However, in recent years we have seen how the Governments of the countries involved have been adding steps to this project. Spain and Morocco work has accelerated in recent months to make a railway tunnel a reality that would pass under the Strait and that would connect Punta Paloma (Tarifa) with Cape Malabata (near Tangier). The infrastructure (if it is built) would easily become a historic engineering work, allowing people to cross from one continent to another in just half an hour. What are we talking about?. The project contemplates a strictly railway tunnel, without a viaduct or vehicle lanes (something it originally discussed doing), with a total length of about 42 kilometers between stations, of which 27.7 are submerged. The deepest point it would reach 475 meters below sea level and would cross what is known as the Camarinal Threshold, the shallowest area of ​​the Strait and, curiously, much more complex from a geological point of view. What would it be like inside?. According to data collected by the Spanish public company SECEGSA, the design proposes two independent single-track tubes, each with an inner diameter of 7.90 metersand a 6-meter central service gallery for maintenance and emergency tasks. This gallery would connect with the main tubes through transversal passages every 340 meters. At the lowest point of the layout there would be a safe parking area with intervention areas and a smoke extraction system. High-speed trains for passengers and shuttle convoys for goods and vehicles would run through the tunnel. Who is in charge. The project is moving forward in two ways. On the Spanish side, the work is coordinated by SECEGSA, a public company created in the eighties precisely to promote this connection. On the Moroccan side, the Government has decided to concentrate all its efforts on the channel with Madridruling out other parallel paths. The most recent and relevant agreement It was signed on December 4, 2025 in La Moncloa between the Minister of Transport of Spain, Óscar Puente, and his counterpart in Morocco, Karim Zidane. It contains a memorandum between the Spanish National Geographic Institute and the National Center for Scientific and Technical Research of Morocco (CNRST) to jointly study the seismicity and geodynamics of the Strait for three years. Financing. In March of this year, the Spanish Government approved an additional transfer of 1.73 million euros to finance technical studies, according to they count from La Razón. Added to this item is a marine research campaign commissioned by the Higher Council for Scientific Research (CSIC) with a budget of 553,187 euros, published in the Official State Gazette. This campaign, lasting about 15 days and scheduled for the first half of 2026, includes high-resolution bathymetry, sampling of sediments and rocks from the seabed, and laboratory analysis. Three CSIC institutes participate (Marine, Geological and Mining Sciences, and Oceanography), the Navy Hydrographic Institute and the United States Geological Survey. Obstacles. The key is in the Camarinal Threshold. The Spanish subsidiary of the German manufacturer Herrenknecht, specialized in tunnel boring machines, carried out a feasibility study that concluded that the work is technically possible with current engineering, although he warned of enormous logistical and economic challenges. The subsoil of that area is made up of materials from the Flysch Complex, with layers of sandstone and clay of turbidite origin, covered by more recent sediments. This geological variability, added to the fact that the Strait is located on the Azores-Gibraltar-Tunisia fracture, the same one that caused the devastating Lisbon earthquake of 1755makes excavation a particularly complex challenge. On the other hand, it should be noted that the Strait is not an easy scenario. More than 100,000 ships pass through its waters a year and the study area is located within a Special Conservation Area with a protection plan for orcas. More than 1,900 species of marine flora and fauna have been recorded, which requires obtaining certain environmental permits before doing anything. How much will it cost. Although there are no concrete figures on how much the project would cost, Morocco World News situates the estimated cost alone for the Spanish part is above 8.5 billion euros, while other media such as El Diario elevate the total budget above 15,000 million, to be distributed between Spain, Morocco and the European Union. In any case, it will be one of the most expensive infrastructures ever built in the region. When will it be ready. Here it is advisable to lower expectations. And the deadlines that are managed They place the possible inauguration between 2035 and 2040always in the best of scenarios, but very possibly set more in the 2040s than before (that is, if the work is ever executed). If the seismic and geotechnical studies end up being favorable, a reconnaissance gallery could be put out to tender in 2027, requiring several years to complete to obtain detailed information on the terrain and the viability of the project. Why it matters beyond engineering. Connecting Africa with Europe by rail would encourage trade in very profitable ways, integrating the railway networks of the Maghreb with the European system and making the peninsular south take on a completely different color as a logistical node. Of course, it also raises political debates, especially regarding immigration management. Be that as it may, we will still have to wait to find out if the project finally materializes. Cover image | SECEGSA and Google Earth In Xataka | Amazon wants to save its ‘cloud’ from the mud: the plan to shield Zaragoza against large floods

A gigantic tunnel boring machine 16 meters in diameter is devouring the sea floor under Genoa. It is your solution against traffic

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Under the port of Genoa, the largest in Italy, there is a machine that aims to devour the sea floor meter by meter. And it does so from the bowels of the earth, 45 meters deep and without interrupting the traffic that passes above it every day. The key is a 16 meter diameter tunnel boring machine that is drilling into the seabed like butter. This is how Italy is solving one of its most entrenched mobility problems, and in the process building the first underwater tunnel of the history of the country. A problem that has been unsolved for decades. Genoa is a city trapped between the Mediterranean Sea and the foothills of the Apennines. It has no room to grow. Its historic center is a labyrinth of narrow streets, and east-west traffic has always been a headache. The solution adopted in the 1960s was to build a gigantic elevated highway, the Sopraelevata Aldo Moro, which crosses the city like a concrete scar. for her About 80,000 vehicles pass through each daybut at a high price: it blocks the view of the sea, generates constant noise and, for many citizens, is a barrier that separates the city from its own port. Its demolition has been stalled for years because no one knows what to do with that traffic in the meantime. Tragedy. The tunnel project was born from an agreement between Autostrade per l’Italia, the Italian Ministry of Transport and local administrations as compensation to the city after the collapse of the Morandi bridge in 2018. That collapse, which claimed 43 lives, left Genoa without one of its main accesses and put the highway concessionaire company under the spotlight. As part of the repair agreement, signed in October 2021, Autostrade per l’Italia, the Liguria Region, the Western Ligure Sea Port System Authority and the Municipality of Genoa agreed to build this underwater tunnel. It is, in practice, the great work of compensation for a city that suffered a tragedy. What is being built. The total route is 4.2 kilometers, of which 3.4 run under the sea floor. It will consist of two separate galleries, one in each direction, each 16 meters in diameter, and will reach a maximum depth of 45 meters below sea level. When completed, it is expected to be Italy’s first underwater tunnel, the largest in Europe (with pardon is being built between Germany and Denmark) and the fourth largest in the world by diameter. Next to nothing. The key: a Hydroshield TBM. Excavating under an active port without interrupting its activity is a monumental challenge. The solution is a TBM tunnel boring machine (Tunnel Boring Machine) Hydroshield type. Each of the two main galleries will be constructed by mechanized excavation with a Hydroshield type back-pressure armored TBM milling cutter, with an excavation diameter of approximately 16 meters. Why this type and not another? In a Hydroshield TBM, the balance in the excavation chamber is maintained through the pressure of water or bentonite slurrywhich stabilizes the excavation face. The extracted material is mixed with these sludge and transported to the surface through pipes. It is the ideal technology for unstable terrain with the presence of water: it allows you to continue drilling without the sea floor crumbling and without the sea entering the gallery. The port above is still working. The gallery measures 15.4 meters in diameter on the outside, but the useful space for circulation is somewhat less, 14.3 meters, because the walls are considerably thick. These walls are built by assembling prefabricated pieces of concrete, as if they were the staves of a giant barrel, joined together with screws and sealed with rubber gaskets so that water does not enter. As if that were not enough, an additional layer of concrete is added inside that further reinforces the impermeability, especially in the sections that are just below the port. The result is a practically airtight tube capable of withstanding the pressure of the sea on its walls. lto logistics of the work. You can’t just place a tunnel boring machine on the seabed and run it. First you have to prepare the ground. The tunnel boring machine was thrown from an attack pit in the San Benigno areaon the west side of the city. To free up that space, Autostrade first had to move a port railway line that ran through there. The railway route, about 700 meters long, has been moved about 70 meters to the south with respect to its previous position, running parallel to the port sopraelevata until passing under it in its final section. Deadlines. Preparation works started in 2023, and work began in March 2024. However, the full tender for the construction of the two main galleries was not approved until January 2026. The specifications set a period of 75 months to complete the entire work. According to the latest Autostrade documents, the TBM will complete excavation work in October 2030, with full completion of the work planned for 2031. Budget. The project started from a budget of 700 million euros, although the mayor of Genoa, Silvia Salis, confirmed that Autostrade now places the cost at more than 1,129 million euros. An escalation of costs that, according to the original agreement between the parties, is covered by a mechanism linked to national highway tolls. Transformation. When the tunnel is completed, it will allow the creation of new green areas (10 hectares, distributed in three public parks) and pedestrian routes that reconnect the city center with the sea. In the San Benigno area, on the new railway gallery already in use, the Lantern Park will be built, which will connect that sector with the city’s historic lighthouse through a bicycle and pedestrian path. In Xataka | Mexico touches the sky with a new and elegant skyscraper of 484 meters and 99 floors: it will be the tallest in all of Latin America

join the new tunnel with the old

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The works of A-5 tunnel They have been conditioning Madrid’s traffic and the lives of its residents for a long time. The good news is that They are almost finishedat least as far as excavation is concerned. And just as has counted Borja Carabante, delegate of Urban Planning, Environment and Mobility of the Madrid City Council, the excavation will end in a few weeks, while the entire work is scheduled to end in December. What exactly is left?. In one interview with TelemadridCarabante confirmed that the excavation of the tunnel out of Madrid will be completed on May 25. On the other hand, the works in the entrance direction have already been completed. Thus, the work enters its interior conditioning phase, and the objective is for vehicles to circulate through the new tunnel in December of this year. A truce for its residents. According to Carabante, these are “the most important works that have been carried out in Madrid since Madrid Río.” And they are not only because of their size, but also because of the difficulty of executing them without closing the road to traffic at any time: nearly 100,000 vehicles pass through the A-5 a day, while underneath there lives a dense network of pipes, telephone wiring and other facilities. The residents of the southwest corridor, including those of Móstoles and other municipalities on the outskirts, They have been adapting for months to the traffic cuts and the problems that the works have caused. In detail. Just like account Telemadrid, around 600 workers and around 400 machines are currently working on the works. “We already have the Paseo de Extremadura tunnel, the connection with the old tunnel. Now we are executing the lower slab of the tunnel and then we will lay the pavement where the vehicles will circulate,” said the general director of Planning and Infrastructure of the City Council, Dolores Ortiz, in the ‘Buenos Días Madrid’ program. Starting in June, the beams of the Batán and Boadilla structures will be placed, and after the summer the development of the new green corridor on the surface will begin. The section of the new tunnel begins on Padre Piquer Street. However, there is still a delicate point to be reached. And the connection between the new tunnel and the old one will involve cut the 30th Street tunnel completely to demolish the wall, excavate and integrate all the systems. According to the media, the tunnel will have three lanes in each direction (two for private traffic and one for buses and high-occupancy vehicles), with artificial intelligence systems and cameras to verify that these conditions are met at all times. Material reuse. In terms of sustainability, there are also actions worth commenting on. And according to they count From the City Council, all the material extracted during the excavation is being reused: part will be used for the meter of earth that will go on the roof of the tunnel and the rest is shaping new hills that will be covered with vegetation in Aluche. The old pavement of the A-5 has been used in the temporary detours. Besides, geothermal energy will be used to air condition the Ángel González Library and photovoltaic panels to power the future green promenade. And now what. The tunnel opens in December, but that doesn’t mean everything is finished. And when it opens, it will be at that moment when the works on the surface will begin, urbanizing the land of the corridor so that the new accesses become an integrated part of the avenue. On the other hand, the City Council has on its radar the extension of the burial to the M-40although Carabante recognizes that it is a “very complicated” project and of an even greater economic magnitude than the current phase. Its execution is planned for the next legislature and would depend on co-financing with the Ministry of Development, linked to the development of Operation Camp. In Xataka | Many of us do it wrong: Madrid firefighters explain how to charge your cell phone at home to avoid accidents

The gigantic Mayrit tunnel boring machine makes its way through the underground of Madrid to transform Metro L11

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It started on March 26 and in just over a month it has already left behind the first 200 meters of tunnel under the capital’s subsoil. The Mayrit tunnel boring machine advances towards Madrid Río with the objective of completing more than 5,200 meters of gallery before the end of 2027. And all to prepare the ground for the transformation of Metro L11. full throttle. The first month was slower than usual because the TBM was still in the adjustment phase. So has explained it the Department of Transport and Infrastructure of the Community of Madrid. And those first 200 meters have been drilled with the machine still running. However, from now on, Mayrit will reach its cruising speed: between 400 and 500 meters per month, which is equivalent to about 15 meters per day. What exactly is he doing underground. In addition to excavating (logically), as its cutting wheel, equipped with 54 discs, 172 picks and 24 battens, crushes the ground, the machine also places rings of concrete segments that form the final structure of the tunnel. At the same time, extracts about 3,500 tons of earth per day through conveyor belts that extend to the surface, where a hundred and a half trucks are responsible for transporting this material to landfills and disused mining operations. Transfer to the capital. Assembling a 98-meter-long, 1,500-ton machine at a depth of 27 meters is not a simple process. Mayrit was manufactured for 20 months in the German city of Schwana and traveled 2,000 kilometers by land and sea until reaching Madrid. Once here, it took 70 workers three months to assemble it piece by piece inside the future Comillas station. When does it stop and why? Mayrit works tirelessly 24 hours a day, seven days a week, in continuous shifts. But has scheduled stops. The first will be when it arrives at the future Madrid Río station, 1,114 meters from Comillas. There it will undergo a technical review of up to two weeks. Then he will repeat the process in Palos de la Frontera, Atocha and, finally, Conde de Casal. It can also stop at any intermediate point if any part needs replacement, which is scheduled approximately every 1,000 meters. The final destination and when it will arrive. The total route entrusted to Mayrit is 5,227 meters between Comillas and Conde de Casal, where the future interchange is located. The general director of Collective Transport Infrastructure of the Community of Madrid, Miguel Núñez, estimated In statements collected by 20 Minutes that the complete excavation will take between 13 and 14 months. With startup at the end of March, that puts the end of drilling around May or June 2027. Opening to the public will take a few more months, once installations, equipment and testing are completed. The work behind the tunnel boring machine. To complete this section 32,000 tons of steel will be needed210,000 cubic meters of concrete and more than 25,000 segments, whose production began in September 2025 in a factory created expressly for this project. The overall progress of the works already exceeds 50%, according to the City Council, and the investment in this phase amounts to more than 740 million euros. The biggest project behind it. All of this is just a part of something much bigger. The future Line 11 will travel 33.5 kilometers from end to end of Madrid, from Cuatro Vientos to Valdebebas, with 20 stations that will connect points such as Atocha, the airport, Zendal Hospital or the future Formula 1 circuit in Ifema. The complete route can be done in one hour and six minutes. The total investment exceeds 2.5 billion euros and the works will be carried out in four phases until 2031. Cover image | Community of Madrid In Xataka | From devouring diesel to being 100% electric: the incredible transformation of a 650-ton mining excavator in India

At 11 km long and with a roof with a light show, China’s longest underwater tunnel has become a tourist attraction

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Under the waters of Lake Taihu, in the Chinese province of Jiangsu, lies the longest underwater tunnel ever built in China. Although it serves today as a great solution to decongest one of the most dynamic regions in the country, it has also become, almost by surprise, a tourist destination on its own merits. The reason: a majestic ceiling full of LED lights that change color and an architecture almost designed more to be contemplated than to be functional. A key point. As we mentioned, the tunnel extends under Lake Taihu, in Jiangsu province, about 50 kilometers east of Shanghai. It aims to connect the expressways of Suzhou, Wuxi and Changzhou to relieve traffic pressure in the lakeside cities, while also serving to boost economic development from the Yangtze River Delta region. It is also a segment of the highway that connects Shanghai and Nanjing, the former national capital. For this reason, it is a key piece in China’s infrastructure network, but its design and light show have also led to it being transformed into a whole tourist experience. Figures. With 10.79 kilometers in length, the tunnel had a cost of about 9.9 billion yuanabout 1,230 million euros. Work began in 2018 and lasted almost four years. To build the two-way tunnel, with six lanes and 17.45 meters wide, more than two million cubic meters of concrete were used. For ventilation, there are three complexes distributed along the surface of the lake that guarantee air circulation inside. The challenge of building under the mud. It was not a simple work. The bed of Taihu Lake is formed by large accumulations of clayey silt, which made it impossible to use conventional excavation methods with tunnel boring machines. The engineering team opted for a cofferdam system: the route was divided into nine sections and, in each one, a temporary dike was built to “create solid ground” and work dry. Once that section was finished, it was filled with water and moved on to the next. According to collect Tunnels & Tunnelling, one of the biggest challenges was waterproofing the structure, since at some points the tunnel is 20 meters below the lake bed. Thes LED lights yesThey always improve everythingeither. Their figures and the work that had to be done for something of such magnitude to materialize is impressive. But the tunnel has attracted more and more attention for a clear reason: its roof. Those responsible They installed LED lights on the roof of the tunnel to combat driver fatigue during what would otherwise be a very monotonous journey underground. The panels do not simply project a uniform color, but rather show images that change. Ventilation and architecture. But the LEDs on the ceiling are not the only eye-catching element. The three ventilation points that emerge on the surface of the lake have been conceived as sculptural pieces. According to China Dailythe one located in the center of the tunnel was transformed into an artificial island 150 meters in diameter; that on the western side, near Mashan, is shaped like a conch; and the one on the eastern side, next to Nanquan, evokes the silhouette of an ancient boat. The most striking is the one known as “Jade Snail”: 45 meters in diameter and 39 meters high, it is equipped with 174,000 LED light points. A tunnel that generates tourism. The CCCC construction company points out that the Taihu tunnel is now the second highway between Shanghai and Nanjing, and has increased the number of visitors to the tourist enclaves of Lingshan and Nianhua Bay by 50%. The Mashan area, directly connected by the tunnel, is home to the Lingshan Great Buddha, one of the largest in the world and a pilgrimage destination for millions of people. Liu Xiaoyu, head of Wuxi National Taihu Lake Tourism Resort, pointed out told China Daily that “the tunnel will bring more tourists to the Lingshan Scenic Area and hotels in the area.” recordd. At almost 11 kilometers, the Taihu is the longest underwater tunnel in China, but it is not the first in the world. The title of longest underwater road tunnel remains with the Norwegian Ryfastwith 14.3 kilometers, connecting the city of Stavanger with the municipality of Strand. On the other hand, if we talk about underwater tunnels in general, the Eurotunnel (which links England and France by rail) retains the absolute record with 37.9 kilometers of submerged section. Images | CGTN In Xataka | Xiaomi or Xpeng car factories are so advanced that they have become the favorite destination of Chinese schools

China is building a tunnel under the sea for its high speed. It has already reached a record depth

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Under the seabed, dozens of meters deep, there is a work that is progressing with a minimal margin of error. It cannot be seen from the surface, but it is part of a railway infrastructure key in southern China. According to CGTNthe country has reached a new milestone in the construction of a high-speed underwater tunnel: the excavation has already reached 113 meters under the seabed. The figure is not minor, because it places the work at a point where the geological conditions and water pressure significantly increase the technical difficulty. This advance is part of a much larger infrastructure that is taking shape in the south of the country. The 116-kilometer Shenzhen-Jiangmen high-speed line is designed to connect both cities in less than an hour, integrating into the rail corridor that runs along the Chinese coast. In this way, the project has entered a particularly demanding phase, in which the tunnel under the Pearl River estuary becomes one of the most technically complex points of the entire work. A section under the sea that concentrates the greatest technical challenge At the center of this phase of the project is the underwater infrastructure that requires refinement of each step. To execute it, the work relies on a large diameter tunnel boring machine developed in China. The machine, known as “Shenjiang-1”, has kept the excavation going continuously, even during festive periods such as Qingming. It not only drills the ground, it also allows progress while the interior lining of the tunnel is being built, a system that seeks to gain efficiency in one of the most delicate points of the route. From there, the challenge stops being just mechanical and becomes conditioned by the terrain. The TBM must traverse 13 different strata, with five types of composite geology and six fault zones along the route. These types of conditions force the operation to be constantly adjusted, because each layer can respond differently to the excavation. In this context, moving forward does not depend solely on the power of the machinery, but also on maintaining control in a challenging environment. Added to this complexity of the terrain is a less visible, but equally determining factor: the pressure of the water at those depths. The tunnel is planned to reach a maximum of 116 meters below the seabeda level at which hydraulic conditions become especially demanding for the machinery and the structure itself. To operate in this environment, the system uses a sludge circuit that fulfills a double function: on the one hand, it reduces friction at the excavation face and, on the other, it transports the extracted material to the surface, where it is separated and reused in the process. While the machine advances, the tunnel is not far behind. Just behind the excavation face, the teams are assembling the prefabricated concrete segments that form the interior lining. Each one measures around two meters wide and nine are needed to complete a ring in a structure that exceeds 13 meters in diameter. This system allows excavation and construction to progress at the same time, reducing time and helping to maintain the pace of execution. The magnitude of this work is better understood when put into perspective. Official information indicates that this section extends over 13.69 kilometers and crosses several waterways at the mouth of the river, located between Dongguan and Guangzhou. It is a key piece within a line designed to improve the connection in the Guangdong-Hong Kong-Macao Greater Bay Area. Beyond the depth already achieved, the project seeks to strengthen regional connectivity and support economic integration in one of the most active areas of the country. Images | CGTN In Xataka | Singapore is literally coming into its own: reclaiming 25% of land from the sea and turning wastewater into drinking water

China has been pushing the boundaries of engineering for years. Its gigantic high-speed tunnel boring machine has just given another example

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China has been developing large infrastructures and its own machinery to execute them for years, with projects that tend to stand out for their size and the technical control they require. It is not just about building more, but about doing so under increasingly demanding conditions. This pattern is repeated in very different areas, from energy to scientific research, and also in transport infrastructure. Under this logic, the appearance of new machines and projects is not an exception, but rather the continuation of a clear trend that now adds a new chapter with the “Linghang” tunnel boring machine. The advance. “Linghang” has completed the section under the Yangtze Riverwith a continuous excavation of just over 11 kilometers, according to CCTV. The machine began its journey on April 29, 2024 from Chongming Island, in Shanghai, and after 23 months of work, it completed the underwater section of the river, surpassed the south dam and came ashore in Taicang, in Jiangsu province. The movement is not minor: it involves completing the section under the watercourse, one of the key points of the work, and leaving the project one step away from its next milestone. What’s behind. The operation is integrated into the tunnel Chongming-Taicanga key work within the Shanghai-Nanjing section of the Shanghai-Chongqing-Chengdu high-speed corridor. With a total length of 14.25 kilometers, this infrastructure brings together several technical milestones, including the world’s longest single head excavation distance in a high-speed tunnel, with 11.32 kilometers, and a maximum depth of 89 meters under the Yangtze. The design contemplates the passage of trains at 350 km/h even in the underground section. The machine inside. The tunnel boring machine used in this project has unusual dimensions even within this type of work: it measures about 148 meters in length and weighs around 4,000 tons. according to Global Times. It is equipped with an intelligent control system called I-TBM, designed to automatically manage a large part of the excavation process, from internal pressure to the forward position or the exit of the material. Added to this are elements such as high-pressure seals, a long-lasting main bearing and a cutting head prepared to withstand demanding conditions under the river. A project that is not an isolated case. In recent years, the country has built facilities such as the Three Gorges Dam, the FAST telescope either the EAST reactorprojects that, although they belong to different areas, share the same base: scale, technical control and own development. In this context, this type of machinery is best understood not as a specific milestone, but as one more piece within a sustained line of work. A close reference. In Spain, the Mayrit tunnel boring machine, currently in use in the expansion of line 11 of the Madrid Metrooffers a useful point of comparison to understand the magnitude of this type of machinery. Measuring about 98 meters in length, weighing around 1,500 tons and with a diameter close to 9 meters, it is a large piece of equipment within the European context. Images | CCTV In Xataka | Czechia wanted to build a highway and found a problem: an intact 2,000-year-old Celtic city

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