A tunnel-boring machine (TBM) is seen outside a tunnel between Houhai and Keyuan stations of Metro Line 13 after the tunneling project was completed Tuesday. Line 13 starts from Shenzhen Bay Checkpoint in Nanshan District and runs 22.4 kilometers to Shangwu North Station in Bao’an District. It has 16 stations including 11 interchange stations. Liu Yujie |