The Delhi Metro Rail Corporation (DMRC) announced the successful completion of the first twin tunnels breakthrough on the Janakpuri West - R K Ashram corridor, marking a significant achievement in the Phase IV construction project. The twin tunnels, linking Derawal Nagar to Pulbangash, were excavated by two tunnel boring machines (TBMs)...
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that emerged concurrently at Pulbangash Metro Station. This 3-kilometer-long tunnel drive, spanning over 14 months, is the longest in Phase IV, with the TBMs operating at an average rate of 8.2 meters per tunnel per day. The tunnels, built at a depth of 14-15 meters, pass through densely populated areas like Rana Pratap Bagh and Punjabi Basti Colony, including a section beneath the Najafgarh drain. Despite the challenging environment, the TBMs successfully navigated through submerged water conditions and beneath the under-construction Ghanta Ghar station without causing any damage. The tunnels have an internal diameter of 5.8 meters and feature six cross passages for passenger safety.