The "lightning-fast" drill bit has entered the underground station S11

TBM No. 1 started from S9 - Kim Ma station, drilled a tunnel with a total length of about 2028m to reach S11 - Van Mieu station, equivalent to completing the installation of a total of 1,350 tunnel lining rings, strictly complying with technical, safety and environmental standards. TBM No. 2 named "Bold" has now drilled about 899m, equivalent to 599 installed tunnel lining rings. After finishing drilling at S12 station - Hanoi station, the drilling head of the TBMs will be dismantled at this station, the remaining auxiliary equipment system will be pulled back and continued to be dismantled at S9 - Kim Ma station.

The — TBM No. 1 tunnel boring machine named "Speed" has officially entered underground station S11.

Mr. Nguyen Ba Son - Deputy Head of Hanoi Railway Management Board said: "The "lightning speed" of TBM No. 1 to S11 - Van Mieu station is the result of the tireless efforts of the team of engineers, workers, and domestic and international experts over the past time. This is not only an important technical milestone but also a testament to the effective coordination between the investor, consultant, contractor and the city's functional agencies in the complex construction conditions under Hanoi".

Mr. Lee Young Kyeong - Deputy Project Director, representative of Hyundai - Ghella Joint Venture (HGU) shared: “The successful access of TBM No. 1 to S11 - Van Mieu station is an important technical milestone in the construction of the metro tunnel section under Hanoi. As the main contractor of CP03 - Tunnel and underground stations package, we always strictly control the tunneling parameters to ensure no impact on the works and urban traffic above, overcoming many technical difficulties to ensure safe and effective construction. We will maintain this performance in the next stage to contribute to the overall success of metro line No. 3”.

The — Drilling is carried out with care and strict supervision to ensure safety for the project.

As of July 24, 2025, the overall construction progress of CP03 package - tunnel and underground stations reached 62.74%. The tunnel lining work has completed 2,623/3,488 tunnel lining rings, meeting the schedule for servicing two operating TBMs.

The Nhon - Hanoi Railway Station urban railway project is one of the city's key transport projects, contributing to reducing traffic congestion, improving the public transport system and enhancing the quality of the urban environment. The construction of the tunnel section is being carried out with high determination, ensuring safety, quality and progress according to the plan. During the construction process, the project uses a geotechnical monitoring system to ensure monitoring and tracking of ground movement and subsidence.

The tunnel boring work will be carried out with caution and strict supervision to ensure the safety of existing works as well as the quality of the works under construction. The Hanoi Urban Railway Management Board is committed to continuing to coordinate closely with relevant parties to complete the next items on schedule, contributing to changing the face of the capital, conveniently connecting areas and promoting sustainable development, greening urban transport.

Source: https://cand.com.vn/Giao-thong/mui-khoan-than-toc-da-tien-vao-ga-ngam-s11-van-mieu-i776303/