Shenzhen–Zhongshan Link: A new super-connection for the Bay Area

What sounds like a track lifted from a video game has recently become everyday reality for commuters in the Guangdong–Hong Kong–Macao Bay Area. A brand-new link between Shenzhen and Zhongshan brings together record-setting sea bridges, a vast underwater tunnel and an island topped by a futuristic museum. The scheme underlines how transport infrastructure can evolve when engineers are willing to push beyond conventional limits.

A 24-kilometre giant reshapes daily commuting

The Shenzhen–Zhongshan Link stretches for 24 kilometres and dramatically shortens what used to be a laborious journey. A trip that previously took nearly two hours by car or coach can now be completed in about 30 minutes. Signed as route G2518, it acts as a direct high-capacity corridor between two economically powerful cities in the Pearl River Delta.

At its heart, the structure is made up of:

• two enormous bridges over the sea,
• two man-made islands,
• an underwater tunnel just under seven kilometres long.

“The link combines bridges, a tunnel and islands into a kind of ‘super motorway’, which also serves as China’s technological shop window.”

The road is intended not only to pull the surrounding economic zones closer together, but also to broadcast a message about high-tech infrastructure. According to Chinese state media, the build collects several world records, including the longest steel pylon section on a suspension bridge and one of the largest bridge anchor blocks ever cast.

Record-breaking bridge: concrete, steel and hurricane-force testing

On the sea-crossing section, a suspension-bridge system spans the water and ranks among the top tier of global engineering. The anchor block that secures the steel cables contains around 344,000 cubic metres of concrete-enough volume to pour what would feel like an entire small neighbourhood.

In this region, resilience is not a luxury but a requirement. Tropical storms and typhoons regularly sweep across the bay, so the new link had to pass stress tests simulating wind speeds of up to 83.7 metres per second. That equates to well over 300 kilometres per hour. The structure remained stable.

These trials are designed to reduce the risk of traffic grinding to a halt in extreme weather. The aim is to keep the route comparatively dependable even during severe storms-an obvious benefit for logistics chains and commuter flows.

An underwater tunnel built like a multi-lane steel behemoth

At least as striking as the bridges is the tunnel below the sea surface. It is among the widest immersed tunnels made from steel and concrete anywhere in the world. The internal profile is about 46 metres wide, providing room for eight lanes side by side.

At first glance, the tunnel feels like an ordinary urban motorway-just without daylight. Yet the scale and the underlying technology go far beyond that. The tunnel sections were manufactured in advance, floated into position and then lowered into specially prepared trenches on the seabed. There, the segments were joined to form one continuous tube.

Robots on patrol as tunnel sentries

While drivers stay behind the wheel, a digital team keeps watch over the traffic. Inside the tunnel, 14 robots patrol with cameras, sensors and networked communications. They flag anomalies, locate collisions, detect queues and help to support evacuations when required.

“The facility uses a new smoke extraction and ventilation system which, according to engineers, operates around 42 percent more efficiently than conventional installations.”

In a fire, seconds matter. Dense smoke can become life-threatening very quickly in tunnels. The upgraded extraction system is designed to pull smoke out faster and keep escape routes usable for longer. The robots complement this by supplying the fire service and rescue teams with real-time information.

Traffic surge and a tourist draw on a man-made island

Since opening, the scale of demand for such a shortcut has become clear. Operators say the link carries an average of about 86,000 vehicles per day. On peak travel days, volumes climb to more than 181,000 vehicles.

The impact is even more pronounced on public transport. Express coaches using the route have already carried roughly three million passengers. During national holiday periods, tourist numbers in the area rose by a good 100 percent. Hotels, restaurants and attractions in both Shenzhen and Zhongshan are benefiting.

A museum in the middle of the motorway

One unusual feature also makes the project appealing to technology enthusiasts: a new science museum stands on the western artificial island, offering about 2,200 square metres of exhibition space. Its focus is the challenge of building on and beneath the sea-from currents and tides to material fatigue and corrosion protection.

Travellers can stop there for a break before rejoining the carriageway. The island itself covers 137,000 square metres and, from the air, resembles the outline of the Kunpeng-a mythical figure from Chinese tradition said to transform from a gigantic fish into a mighty bird.

“The Kunpeng shape is meant to symbolise how the project moves between sea depth and sky height-a blend of mythology and high technology.”

Key facts about the Shenzhen–Zhongshan Link

Total length	24 kilometres
Construction elements	2 bridges, 1 tunnel, 2 artificial islands
Journey time Shenzhen–Zhongshan	about 30 minutes (previously around 2 hours)
Average daily traffic	86,000 vehicles
Maximum recorded daily traffic	over 181,000 vehicles
Tunnel width	46 metres, 8 lanes
Monitoring	14 patrol robots in real-time operation
Flat toll	around 10 euros

Why China invests so heavily in mega-infrastructure

The Shenzhen area is considered one of the country’s most dynamic economic arteries. Companies in electronics, automotive manufacturing, battery production and the chip industry are clustered closely together. Every minute saved on freight movements and commuting makes the location more attractive.

Projects like this serve several goals at once: they relieve overloaded ferry routes and bypass roads, stimulate trade and tourism, and act as a technological reference point. A country that has risen from inland development to a global high-tech zone within a few decades also uses such structures as a symbol of that ambition.

At the same time, the pressure on engineers and planners is increasing. Long bridges and tunnels in storm-prone coastal zones demand intensive maintenance. Saltwater attacks concrete and steel, while high humidity and temperature swings can encourage cracking and material deterioration. Operators therefore have to deliver not only headline-grabbing construction, but also secure long-term upkeep.

Opportunities, risks and what other countries can learn

The Shenzhen–Zhongshan Link illustrates how transport schemes can be combined with additional functions. Here, a motorway becomes a platform for tourism, education and research. The island museum does more than explain technical details; it also acts as a testbed for new approaches-for example in corrosion protection, ventilation and robotics.

However, such developments do not come with benefits alone. Coastal and marine ecosystems can be highly sensitive to construction activity, land reclamation and altered currents. Creating artificial islands is a major environmental intervention. Authorities therefore need to assess how impacts can be limited and offset-through protected areas, habitat restoration or strict operational requirements.

For other countries facing heavy commuter demand across bodies of water-such as around large river estuaries or island chains-the Chinese project may offer a template. The blend of bridge, tunnel and digitally managed safety makes clear that traditional motorways are not necessarily the end point. Hybrid solutions can open new routes, reduce travel times and, when planned responsibly, reconnect entire regions.