海底高铁隧道
undersea high-speed railway tunnel

The technical proposal for the Ningbo-Zhoushan Railway, China's first high-speed rail with an undersea segment connecting the Zhoushan Islands in East China's Zhejiang province with the mainland, has been completed, the local Ningbo Evening News reported on Saturday.
据《宁波晚报》8月1日报道，中国首条连接浙江舟山岛和大陆的跨海高铁工程——甬（宁波）舟（舟山）铁路项目的技术方案已经完成。