
Recently, the Qingdao Metro Line 1 cross-harbour tunnel has been successfully penetrated. What is its “home position”? It laid a solid foundation for the completion of the entire line of Qingdao Metro Line 1 on schedule. It is reported that the total length of the cross-sea tunnel of Qingdao Metro Line 1 is 8.1 kilometers, of which the length of the cross section is about 3.49 kilometers. After the completion of this subway, it will greatly shorten the transit time…