China's TBM curbs put a quiet squeeze on India's tunnels

China's Commerce Ministry announced on 19 October that it will impose export controls on tunnel boring machines and related items from 18 November, citing national security and the dual-use nature of the equipment. Exporters will need a licence, and customs authorities can hold a shipment while they verify the declaration [1][2].

The measure is not a ban. It is a permission regime, which in practice can be slower and less predictable than a ban. For India, that matters because the machines are bought for projects with fixed deadlines, and because a large share of them has been coming from China, including machines made there by German manufacturers.

What was announced

The controls cover more than TBMs.

• Tunnel boring machines and related items. The core of the announcement, with licences to be granted by the Chinese Commerce Ministry under its export control law and dual-use regulations.
• Walking excavators and plateau-type wet shotcrete machines. Equipment used in difficult terrain and high-altitude construction, which is relevant to Himalayan projects.
• Dredger components. Slurry pumps, dragheads and cutterheads above specified technical thresholds, which affects port and river works.
• Verification at customs. Exporters must declare the control code for each item, and shipments will not be released while the accuracy of the declaration is being checked [2].

The timing is deliberate. The announcement came three days after China published a draft plan to restrict more than 40 cutting-edge technologies, including solar manufacturing and some AI platforms, and on the same day it announced controls on certain drones. Read together, they are part of a wider use of export controls as an instrument of industrial and strategic policy [1].

What a TBM actually is

A tunnel boring machine is a factory on rails. A rotating cutterhead grinds the rock or soil, a shield protects the workers behind it, and a segment erector lines the tunnel with precast concrete rings as the machine advances. The spoil is carried out on a conveyor or through a slurry pipe.

Three features make the machine strategically important.

• It is built for one geology. A machine designed for soft alluvium will not work in hard basalt, and a machine for hard rock will not cope with water-bearing sand. The cutterhead, the motor and the support system are configured for the ground the tunnel will pass through.
• It cannot be bought off a shelf. Order to delivery typically runs into a year or more, and the machine has to be assembled, tested and lowered into a shaft before tunnelling starts.
• It cannot be replaced mid-project. The machine, its spare parts and its specialist crew are a single system. A delay at the border becomes a delay in the tunnel.

That is why the curbs matter more than their value in trade terms. A TBM is not a commodity that can be sourced from another port next month.

Why India is exposed

India does not manufacture TBMs at scale. It imports them from China, Germany and Japan, and the supply chain is more Chinese than the brand names suggest.

The clearest example is the Mumbai-Ahmedabad bullet train. Two customised German-made machines, with cutterheads 13.6 metres in diameter, were shipped from China and arrived in March 2026 after delays. They are needed for the underground stretch of the corridor, including the tunnel under Thane creek, which is one of the most demanding sections of the project [3].

The same pattern appears across the pipeline.

• Metro rail. Delhi Metro Phase 4, Mumbai Metro and Bengaluru Metro all depend on TBMs for underground stretches, and the machines are ordered years before the tunnels are scheduled to open.
• Rail and road corridors. Tunnels on new rail lines and expressways use the same equipment, often in difficult hill terrain.
• Hydropower. Himalayan projects need tunnelling for water conveyance, and the geology is among the most difficult in the world.
• Border infrastructure. Tunnels in sensitive areas carry a strategic dimension that ordinary procurement rules do not capture.

India raised the problem with China more than once. In October 2024, Commerce Minister Piyush Goyal told visiting German Vice Chancellor Robert Habeck that China was blocking the export of TBMs made by a German company in China. The delays continued through 2025 and into 2026, even before the new licence regime [1][3].

The pattern

This is not a single decision about one machine type. It is a sequence.

In 2024, the problem was customs clearance and administrative delay. In 2026, it became a formal licence requirement, announced alongside controls on drones, dredger components and advanced manufacturing technologies. Each step is defensible in Chinese law as a national security measure. Each step also gives Beijing a point of leverage over projects it can identify in advance [1][2].

For India, the lesson is uncomfortable. Strategic autonomy in infrastructure requires control over the equipment that builds it, not only over the contractor who signs the cheque.

What India is doing

The response has two tracks, and neither is quick.

• Indigenous manufacturing. BEML has invited an expression of interest for design consultancy to develop tunnel boring machines in India. That is the first concrete step, not the last: design, prototyping, testing and certification take years, and the first machines will not arrive in time for projects already under way [4].
• Diversification. German and Japanese suppliers can fill some of the gap, but their machines are often built in China too. Moving the manufacturing footprint is a decision for the supplier, not the buyer.
• Project redesign. Where a tunnel can be built by the drill-and-blast method instead of a TBM, some agencies may choose that route. It is slower and more labour-intensive, but it is less exposed to a single supply chain.

The deeper fix is a domestic ecosystem: steel for the shield, bearings, hydraulics, cutter tools, control systems and trained crews. A TBM assembled in India from imported components is an improvement, but it is not self-reliance.

Why it matters beyond tunnels

The TBM case is a template for a larger problem. Critical infrastructure in India, from solar modules to data centre chips to dredgers, depends on supply chains that run through a country with which the border is unsettled.

That does not mean every import is a vulnerability. It means the ones that cannot be substituted quickly, and that sit on the critical path of a national project, deserve a different kind of attention. A TBM is exactly that: a single machine, ordered years in advance, without which a tunnel does not happen.

What to watch

• 18 November. The licence regime takes effect. Watch the first clearances, and the first unexplained delays.
• The bullet train. The Thane creek tunnel is the most visible test. Any slip in the tunnelling schedule will show up in the project's completion date.
• BEML's programme. An expression of interest is a start. A prototype and a certified machine would be the real milestone.
• The supplier response. If Herrenknecht and other German firms shift more production out of China, the leverage weakens. If they do not, it does not.

Quick answers

What did China announce? Export controls on tunnel boring machines and related items from 18 November 2026, requiring exporters to obtain licences from the Chinese Commerce Ministry [1][2].

Is it a ban? No. It is a licensing regime, but licences can be delayed or refused, and customs can hold shipments during verification [2].

Why does it matter for India? India imports most of its TBMs, and they are on the critical path of metro, rail, hydropower and border tunnel projects [1][3].

Which projects are most exposed? Underground metro lines, the Mumbai-Ahmedabad bullet train, hydropower projects in the Himalayas and tunnels in border areas [1][3].

What is India doing about it? BEML has begun the process of developing an indigenous TBM, and agencies are looking at German and Japanese suppliers and alternative tunnelling methods [4].

Sources

1. The Hindu: China imposes export controls on tunnel-boring machines sought by India, citing national security. 19 October 2026. https://www.thehindu.com
2. The Economic Times: China announces export curbs on key machinery used in India's infrastructure development. 19 October 2026. https://economictimes.indiatimes.com
3. Metro Rail News: First tunnel boring machine launched for the Mumbai-Ahmedabad bullet train project. July 2026. https://metrorailnews.in
4. Moneycontrol: BEML plans to make tunnel boring machines to cut dependence on China. 28 August 2025. https://www.moneycontrol.com
5. Reuters: China commerce ministry announces export controls for tunnel boring machines. 19 October 2026. https://www.reuters.com
6. Government of China: Export Control Law and Regulations on Export Control of Dual-Use Items. https://www.mofcom.gov.cn