Watch how workers assemble a giant shield machine inside a cavern of the Longgang Tunnel on the Shenzhen-Shenshan high-speed railway. Hundreds of split parts are pieced together in an area too cramped for large cranes. #PrecisionEngineering #ShieldTunneling #China

Watch how workers assemble a giant shield machine inside a cavern of the Longgang Tunnel on the Shenzhen-Shenshan high-speed railway. Hundreds of split parts are pieced together in an area too cramped for large cranes. #PrecisionEngineering #ShieldTunneling #China

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