Tunnel Boring Machine has excavation diameter of 13.8 meters.  First AI (artificial intelligence) deep learning technology is application for a slurry TBM.

'The shield tunnel in this section is 2923 meters long, has a maximum burial depth of 29.82 meters, has a large and undulating slope, and has a maximum slope of 25‰. It has the characteristics of large diameter, sticky soil, and high risk'.

http://finance.people.com.cn/BIG5/n1/2023/1212/c1004-40136924.html