A giant shield tunneling machine with a diameter of 16 meters rolled off the production line Sunday in Changsha. This machine, 150 meters in length and 4,300 tons in weight, is the largest shield tunneling machine produced by China so far.
A giant shield tunneling machine with a diameter of 16 meters rolled off the production line Sunday in Changsha. This machine, 150 meters in length and 4,300 tons in weight, is the largest shield tunneling machine produced by China so far.