![](http://www.ecns.cn/hd/2024/04/19/0ecc34990c3b4d06ac486b4805a199cb.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
With an excavation of 14.57 meters, and a weight of 460 tonnes, the machine was completed installation on Thursday.
![](http://www.ecns.cn/hd/2024/04/19/0d0b8a16e3e6476c8e318d3605f03fcc.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/e42d68d20e4044af82b9deb5bd4f50ac.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/66da5260abf64c1f9ef2ab74a8c0720d.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/f181a9d8d1314826acae8f03e21c0d79.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/d94b32a165d14eda8521a38875d8c99d.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/1203cac1abcd4d72b80294a0e13ca96d.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/93d64c6dcb104f2f8a07dd3744dff9f7.jpg)
A dragon pattern is seen on the tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/8b5395e69f7e4c5eba353e96caeb06c9.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)
![](http://www.ecns.cn/hd/2024/04/19/e7993898729c46c1b0b9396cd1a5d7e2.jpg)
Photo shows the installation site of tunnel boring machine Yongzhou at the construction site of the world's longest undersea high-speed railway tunnel in Ningbo, east China's Zhejiang Province, April 18, 2024. (Photo: China News Service/Wang Gang)