People's Daily inform Tunnel Boring Machine (TBM) "Yongxing" pass 2500 meter boring under sea Zhanjiang Bay sea area. It continue bore in land main city of Zhanjiang. Tunnel 9640 meter long and 2500 meter under sea. Maximum depth 31 meter. It is single hole and double track tunnel.

Guangdong Province Guangzhou-Zhanjiang high-speed railway 400 km long and design speed 350 kilometers per hour.

http://finance.people.com.cn/BIG5/n1/2022/1224/c1004-32592996.html