- Project length 8.05 kilometers. 2.5-kilometer road in Qianhai + 1.1-kilometer undersea tunnel + 4.45-kilometer road in the Dachan Bay area

- The Mawan tunnel use largest diameter TBM used for a undersea tunnel in China.

- TBM used is 15 meter diameter jointly developed by German company Herrenknecht and Shanghai Tunnel Engineering Co. Ltd

New is in English:

https://www.sz.gov.cn/en_szgov/news/latest/content/post_11458206.html