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flag Jinan’s new subway line opened Dec. 27, 2025, navigating karst springs with safeguards that helped Baotu Spring reach its highest level since 1966.

flag Jinan Subway Line 4, China’s first to run through a karst spring area, began operations on December 27, 2025, in Jinan, Shandong Province. flag The line, designed to reduce traffic congestion and travel time, navigates the city’s fragile karst geology while protecting nearly 1,000 natural springs. flag Engineers rerouted the line to avoid aquifers, deepened tunnels, used specialized shield machines to prevent ground settlement, and installed U-shaped water diversion channels. flag Monitoring shows Baotu Spring reached a water level of 30.32 meters—the highest since 1966—indicating the project’s environmental safeguards are effective.

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