People's Daily report on June 5, second mud-water balance tunnel boring machine "Shenwan No. 2" of Guangzhou-Dongguan-Shenzhen Intercity Rail Transit (Shenzhen Airport to Qianhai Section) project launched. For longest intercity railway submarine tunnel in China.

The 4.5km underwater tunnel between Shenzhen Airport and Gushu Working Shaft is twin-tube. Two 9.14m diameter mud-water balance TBM work.

China Railway 14th Bureau Group TBM expert group optimized cutter head, cutter configuration, shield tail seal design, improved for high head pressure.

http://politics.people.com.cn/BIG5/n1/2021/0703/c1001-32147515.html