India, Dec. 1 -- The Delhi Metro Rail Corporation (DMRC) has finished constructing an underground tunnel at the Pulbangash metro station on Red Line, as part of the Janakpuri West - RK Ashram Marg extension of the Magenta line, officials said on Sunday.

The tunnel has been built between the Pulbangash on Red line and the upcoming Sadar Bazaar station on the Magenta line.

DMRC officials said the work on the tunnel included extensive ground strengthening around the existing pier. "The Tunnel Boring Machine (TBM) had to carefully navigate and create the tunnel below the elevated viaducts on which trains of the Red line were operational. The Red line viaduct here stands on open foundations with a balanced cantilever span and so tunnelling b...