The Tuen Mun - Chek Lap Kok TBM otherwise known as Qin Liangyu or more formally, the Mixshield S-880 was the world's largest tunnel boring machine launched in June 2015 by Herrenknecht in Germany.
The contract for the project was around HK$ 18.2 billion (US$ 2.3 billion)[3] The machine had a diameter of 17.6 metres (57.7 ft),[4] 0.1 metres (0.3 ft) more than Bertha, the previous largest tunnel boring machine.
[5][6] Outside of its cutting diameter, it had an overall length of 120 metres (393 ft 8 in) and weighed 4,850 tonnes (5,346 US-tons).
[2] The machine would excavate a 5 km-long underwater tunnel, working at pressures as high as 5 bars.
[2] The tunnel boring project began in October 2018 after the cutterhead conversion and was completed by the end of 2020.