The Delhi Metro Rail Corporation (DMRC) on Friday completed a significant tunnelling milestone on the Aerocity–Tughlakabad corridor after a Tunnel Boring Machine (TBM) broke through at Tughlakabad Railway Colony station.

https://www.hindustantimes.com/cities/delhi-news/delhi-metro-s-golden-line-corridor-reaches-key-tunneling-milestone-101749319358920.html