Largest Tunnel Boring Machine by Excavation Diameter

Qin Liangyu TBM (S-880)

Tuen Mun–Chek Lap Kok Link, Hong Kong · Hong Kong Special Administrative RegionSatellite view · Google Maps

Herrenknecht's S-880 Qin Liangyu Mixshield was deployed on Hong Kong's Tuen Mun–Chek Lap Kok Link, with a maximum excavation diameter of 17.63 m, documented as the largest operational TBM diameter.