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Record-breaking Metro tunnel completed

Writer: Chen Siqi  |  Editor: Lin Qiuying  |  From: Shenzhen Daily  |  Updated: 2025-05-13

Engineers in Shenzhen have completed a key section of the city’s expanding Metro network, setting a national record for the largest underground excavation ever undertaken for a Metro tunnel.

An aerial view of a part of Phase III of Shenzhen Metro Line 8. File Photo

The newly finished tunnel, part of Phase III of Shenzhen Metro Line 8, has passed inspections, clearing the way for track-laying. The project’s most technically challenging segment features a single-bore, triple-track tunnel with an excavation span of nearly 24 meters — wide enough to fit a six-lane highway underground.

Running 3.7 kilometers from Xiaomeisha in Yantian District to Xichong in Dapeng, the new extension includes one underground station and a train depot.

Once operational, Line 8 (Phase III) will connect with other Metro lines to form a continuous transit corridor across Shenzhen.


Engineers in Shenzhen have completed a key section of the city’s expanding Metro network, setting a national record for the largest underground excavation ever undertaken for a Metro tunnel.