Group 1 - The Huashansong Tunnel, part of the Yukun High-speed Railway, has successfully completed the connection between the inclined shaft and the No. 2 horizontal tunnel, improving ventilation and material transport conditions [1] - The tunnel spans 16.4 kilometers and is located in a complex geological environment, classified as a "geological museum" due to its challenging conditions, including multiple faults and high-risk zones [1] - The construction strategy involved simultaneous excavation from multiple auxiliary tunnels, with eight working faces opened to enhance efficiency, addressing the high-risk classification of the tunnel [1] Group 2 - As of now, 14.5 kilometers of the main tunnel excavation has been completed, with full tunnel completion expected in the second half of the year [2] - The overall construction of the Yukun High-speed Railway in Yunnan is progressing steadily, with 95% of the earthworks completed and 85% of bridge and tunnel construction finished [2] - The Yukun High-speed Railway is a key part of China's "Eight Vertical and Eight Horizontal" high-speed rail network, with a total length of approximately 700 kilometers, significantly reducing travel time between Chongqing and Kunming upon completion [2]