The Dali Haidong Tunnel of the Yunnan-Central Water Diversion Project constructed by the Fifth Bureau of China Railway was successfully completed, further laying a solid foundation for the entire Yunnan-Central Water Diversion Project. The Dali Haidong Tunnel is 25.313 kilometers long and is located in the eastern tectonic zone of Erhai in Dali Prefecture, Yunnan Province. It is the fifth longest tunnel in the entire Yunnan Water Diversion Project. It is also one of the most difficult tunnels with complex geological conditions and high construction risks.

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