On December 20, with the completion of the laying of the last pair of tracks on the left side of the water park station to nuo wo mulle station, the first phase of the Hohhot urban mass transit line 2 project under the general contract of China railway construction group and the construction of China railway 16th bureau group was completed.

On December 17, the world's largest underwater shield tunnel was successfully completed, marking significant progress in the construction of inter-city railway in the pearl river delta and adding new impetus to the construction of the guangdong-hong kong-macao greater bay area.

At the construction site of pazhou west section of guangzhou metro line 18, the cutter began to dig slowly, marking the first time that the fastest subway tunnel in China will cross the pearl river for a long distance. This shield tunneling machine will propel more than 1600 meters under the pearl river in an s-shaped manner, which will be the first time to challenge the long distance and small radius crossing the pearl river system in the field of underwater tunnel construction in China.

On December 15, an event was held in Shanghai to launch the project from taicang to the fourth tuantuan section of the shanghai-nantong railway and promote the integrated development of the Yangtze river delta.

On December 10, the length of the liaohe shield tunnel tunneling through the eastern route of the china-russia natural gas pipeline (changling-yonker) exceeded 600 meters, completing one third of the overall progress.

At present, dalian metro line 5 cross-sea big shield "haihong" has been smoothly tunneling 936 meters, is now average monthly speed of 90 meters. The total length of the tunnel is 2,870 meters. It has been 1/3 completed since the launch of the tunnel on January 18 this year.