On Jan 15th, 2025, small-diameter double shield TBM “CREC 1477” completed its FAT in Zhengzhou city, Henan province, China.

That being said, it does hold one Chinese record: It's the largest dual-shield hard rock TBM China has ever built at 590 ft (180 m) and weighing in at 7.8 million pounds (3.54 million kg).

This is the first of two 5.38m diameter double-shield TBMs designed to excavate the 38km, 5m i.d. Polihali Transfer Tunnel ...