China’s 22 km Tunnel: Engineering Miracle or State Power Showcase?

Every driver has experienced the moment when an ordinary journey turns into a story worth retelling. On China’s eastern coast, however, this is no longer a familiar tale of traffic jams or unpredictable weather. It is a 22 km trip beneath the sea, through a tunnel that feels almost like science fiction. Car headlights flow in a ribbon of light between pristine concrete walls and clinical road signs. The moment motorists enter, the outside world vanishes behind an artificial vault that appears to stretch on without end.

Drivers sometimes glance up at the cameras, emergency exits and illuminated signs monitoring every movement. The air feels cool, regulated and almost sterile. Its engineering achievement is tangible, even forceful. Yet another, less visible narrative runs beneath that accomplishment: one concerning power, control and what people may be prepared to accept in the name of progress. It is a story that does not end at the tunnel exit.

Tourist attraction or showcase of power?

On the surface, China presents its new 22 km tunnel as an “engineering miracle” and a gift to motorists. State media show smiling families travelling beneath the sea as casually as taking a new lift. The soundtrack is heroic and the camera shots precisely choreographed.

For many Chinese people, the tunnel represents more than infrastructure: it is an emblem of national pride. It joins cities that until recently appeared divided by a natural barrier. The message is unmistakable: where water once imposed limits, concrete and technology can remove boundaries. It is spectacular, and that is precisely the point.

The figures are dizzying. Nearly 22 kilometres have been excavated beneath the water, involving deep-water drilling, giant concrete rings, and densely deployed ventilation and surveillance systems. Engineers refer to millimetre-level tolerances and safety margins calculated using computer models containing millions of lines.

Authorities emphasise the time saved: hours removed from journeys, quicker lorry movements and uninterrupted connections between two economic hubs. There is already talk of millions of trips each year, local growth and easier tourism. Officially, everyone benefits. Images from the opening ceremony feature red ribbons, impassioned speeches and carefully timed applause. Nothing is out of place. Everything remains under control.

Behind this polished account, less flattering figures are also circulating. Costs are estimated at several billion dollars. Deadlines have been compressed. Political pressure was intense to finish before a symbolic date linked to a Party congress. Engineers understand the implications: less room to refuse, slow work down or renegotiate.

The tunnel therefore becomes far more than a geographical shortcut. It is a monument to the Chinese model and to the state’s ability to marshal enormous resources towards a single objective. A structure designed as much to prove something as to carry someone. In that context, every metre of concrete tells two stories: one of performance and another of obedience.

How China’s 22 km tunnel becomes a political tool

Technically, a project of this kind follows a process that is easy enough to describe but punishingly hard to carry out. First comes seabed mapping, layer by layer, to establish how rock, sand and water will respond. A route is then selected to reduce risks, faults and future maintenance costs.

Then comes the machinery. Giant tunnel-boring machines, concrete segments and drainage systems must all be designed as a living organism, with every part reliant on the others. In the Chinese case, authorities committed heavily: bespoke new tunnel-boring machines, sensor networks and dedicated energy facilities. From a technical perspective, it is impressive. From a human perspective, it is harsh.

Workers describe teams operating around the clock in tightly packed three-shift patterns, with barely even symbolic breaks. The tunnel must, quite literally, advance by a few metres each day or crisis meetings may be triggered. A straightforward machine failure becomes a political issue.

In this type of setting, recurring mistakes tend to arise from the same causes: excessively short schedules, downplayed safety warnings and limited feedback from experience. Frankly, nobody genuinely reads every daily safety report on a project of this scale, even when those reports exist. People skim, filter and prioritise. That is human. When pressure comes from above, however, it becomes tempting to tick boxes rather than raise the uncomfortable questions.

Critical engineers say as much only indirectly, and seldom publicly.

“A tunnel is neutral on paper. What is not neutral is the intention attached to it,” says a Chinese infrastructure specialist living in exile abroad. “When the country’s image becomes the overriding objective, safety and transparency very quickly end up in second place.”

Within this tunnel, sensors do not merely track humidity levels or cracking. They also record flows, behaviour and incidents.

• A high-definition camera system follows every vehicle, ostensibly to prevent accidents.
• Intelligent signs can stop or redirect traffic within seconds.
• Aggregated traffic data provide a detailed map of the daily movements across an entire region.
• The boundary between risk management and population management is narrow.

When technological achievement raises more questions than it answers

Seen from a distance, this tunnel looks like a triumphant story of modernity, one that is almost irresistible to recommendation algorithms such as Google Discover. Enormous scale, advanced technology, spectacular photographs and national storytelling: every ingredient is present. It is the sort of project that attracts clicks, fascinates audiences and prompts a “wow” at first sight.

Some of the public stop there. They view the images, make a quick comment and move on. Yet for those who look more closely, the tunnel poses a real question: how far can a state go in displaying its strength through infrastructure before it becomes an ongoing demonstration of force?

It is possible to admire the engineering while feeling uneasy about everything else. This mixed reaction is increasingly common in response to major Chinese projects: vast dams, seemingly endless bridges and high-speed rail networks running like metal arteries. There is performance, ingenuity and vision.

There are also grey areas: limited transparency around actual costs, difficult access to technical documents and almost no public debate. The cold beauty of concrete sits uneasily alongside political silence. In a 22 km tunnel, that silence can feel particularly long.

For foreign observers, the question most often asked is surprisingly straightforward: who truly gains from this tunnel? Motorists who save time do, certainly. The regions it connects probably do as well. The Chinese state benefits enormously.