Hindustan Times | Delhi Metro Phase-3: A feat of engineering Hindustan Times Delhi Metro Phase-3: A feat of engineering. Abhinav Rajput, Hindustan Times, New Delhi; |; Updated: Aug 19, 2016 16:52 IST. At the Kalkaji interchange station, the DMRC has used the New Austrian Tunnelling Method (NATM) between Kalkaji Mandir and ... |