DMRC Phase-3: Tughlakabad-Aerocity underground tunnel corridor completed

The Delhi Metro Rail Corporation (DMRC) on Saturday completed underground tunnel between Chhatarpur and Chhatarpur Mandir stations on Phase-4 Golden Line, officials said. A 97-metre-long tunnel boring machine (TBM) broke through on Saturday morning at Chhatarpur Mandir station after boring an 860-metre-long tunnel, they said. Two parallel circular tunnels for up and down movement have been constructed on this stretch as part of the AerocityTughlakabad corridor. The breakthrough on the other parallel tunnel was achieved on August 21, the officials said. This new tunnel has been constructed at an average depth of approximately 12 metres. About 613 rings have been installed in the tunnel, with an inner diameter of 5.8 meters, DMRC Principal Executive Director Anuj Dayal said. The tunnelling work involved numerous challenges such as shifting a 66 KV electrical high tension line. Additionally, the TBM had to cross below the existing Yellow Line viaduct without disrupting metro train ...