China is considering building five cross-sea tunnels in the next 20 to 30 years, according to Qian Qihu, an expert in protection engineering and academician of the Chinese Academy of Engineering, at a Sino-Russian symposium on engineering technologies held on May 12.

The five tunnels are the Dalian-Yantai sea tunnel at Bohai Bay linking Dalian in northeast China's Liaoning Province and Yantai in east China's Shandong Province, the project linking Shanghai city to Ningbo in east China's Zhejiang Province, the project in Lingding Sea connecting Hong Kong, Macao with Guangzhou, Shenzhen and Zhuhai, Qiongzhou Strait project connecting Guangdong Province with Hainan Province, and that across Taiwan Strait from Fujian Province to Taiwan.