Group 1 - The "North Gas South Down" energy corridor is China's first natural gas pipeline project using a 1422mm ultra-large diameter, X80 high steel grade, and 12 MPa high pressure level, making it a world-class pipeline project [1] - The project spans 5111 kilometers and passes through 9 provinces, with the northern section completed in December 2019, the middle section in December 2020, and the southern section starting construction in January 2021 [1] - The project has initiated a national leading labor and skills competition to promote safety, environmental protection, engineering quality, innovation, and project progress [1] Group 2 - The West-to-East Gas Transmission Line 4 is another major energy corridor connecting Central Asia and China, with a total length of approximately 3340 kilometers, passing through Xinjiang, Gansu, and Ningxia [2] - The core section from Turpan to Zhongwei is 1745 kilometers long and began construction in September 2022, with a national labor and skills competition launched to enhance project quality and progress [2] - Over 100 participating units and more than 20,000 builders have engaged in the competition, fostering a strong atmosphere for skill improvement and ensuring that the competition follows the pipeline construction [2] Group 3 - The "North Gas South Down" project is expected to achieve full pipeline connectivity 7 months ahead of schedule by December 2, 2024, with an annual gas transmission capacity of 38 billion cubic meters [3] - The West-to-East Gas Transmission Line 4 is scheduled to be operational by June 26, 2025, with an annual gas transmission volume exceeding 15 billion cubic meters, enhancing the reliability and flexibility of energy supply [3] - During the event, a joint activity titled "Model Workers and Craftsmen Enter Campus" was held to inspire youth and promote craftsmanship [3]