World's Longest Under-Mountain Tunnel Revealed: China's 20 km Mega Construction Project |I 2026

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Published Jul 5, 2026

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Discover the incredible engineering behind one of the world's longest under-mountain tunnels as we take you inside China's massive 20 km tunnel construction project. From geological surveys and tunnel boring machines (TBMs) to controlled blasting, reinforced concrete lining, advanced ventilation systems, drainage networks, and state-of-the-art safety technology, this documentary reveals how engineers overcome some of the toughest mountain conditions on Earth.

Watch every stage of this mega infrastructure project, including precision excavation, heavy machinery, tunnel support systems, worker safety, transportation logistics, and the cutting-edge technology that makes these underground engineering marvels possible.

If you enjoy mega projects, construction documentaries, civil engineering, tunnel construction, massive machines, modern infrastructure, factories, and industrial technology, you're in the right place.

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Topics Covered:
• Under-Mountain Tunnel Construction
• China's Mega Infrastructure Projects
• Tunnel Boring Machines (TBM)
• Mountain Engineering
• Underground Construction Technology
• Civil Engineering Documentary
• Mega Project Documentary
• Heavy Construction Equipment
• Modern Infrastructure
• Engineering Innovations

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