About 50 percent of tunnelling work on phase 3 of Mumbai Metro has been completed by the Mumbai Metro Rail Corporation (MMRC). The MMRC finished work on the 28 km-long stretch of the metro corridor.

The Mumbai Metro Rail Corporation (MMRC) has finished work on 50 percent of the tunnelling for the city's only underground metro corridor, Phase 3 of the metro project. The work was completed in barely 19 months since the commencement of construction activity in November 2017.

Of the overall 56 km-long route covered by two tunnels for the upward and downward lines of the metro corridor, the MMRC has completed work on 28 km, which will make up the 33.5 km-long line. This distance has been calculated with the exclusion of underground station boxes in between. Ashwini Bhide, Managing Director, MMRC, has claimed that the task of construction under heritage structures, dilapidated residential buildings and an already functional elevated metro line, was an uphill battle.

The complicated task of underground tunnelling began with the employment of Krishna 1, the first tunnel boring machine (TBM) starting at Naya Nagar, Mahim in 2017. Currently, the MMRC is equipped with 17 TBMs to work along the line so as to complete the project by March 2020.

The Cuffe Parade (in Colaba) to SEEPZ (in Andheri) metro stretch will connect Nariman Point, the business district of Bandra Kurla Complex, the two airport terminals, Mumbai Central, Chhatrapati Shivaji Maharaj Terminus, Kalbadevi, Girgaum, and Dharavi.