Group 1 - The construction of the Yunnan Dali to Ruili Railway's Gaoligong Mountain Tunnel is ongoing, with over 1,000 workers on site during the Spring Festival, marking the 12th year of construction due to complex geological conditions [1] - The tunnel features China's deepest shaft at 765 meters, with improvements in safety and efficiency, including the installation of a simple elevator for material transport [1] - The excavation process has advanced significantly, with over 70% of the tunnel completed by the Spring Festival of 2026, which will drastically improve transportation for local communities [7] Group 2 - A mechanical cooling system has been installed in the tunnel to maintain a working temperature of 28°C for workers, enhancing their working conditions [5] - The hard rock tunneling machine designed specifically for the Gaoligong Mountain Tunnel faced operational challenges due to extreme geological conditions, but a new tunneling method was identified after expert consultations [5] - In the Tarim Basin, over a thousand oil exploration workers are actively collecting geological data for a high-precision 3D exploration project, demonstrating the commitment to advancing engineering projects in challenging environments [8] Group 3 - In the Bohai Bay area, 47 employees are working on key projects to enhance the thermal energy supply capabilities of China's largest offshore heavy oil thermal recovery platform, despite harsh weather conditions [9]