Kolkata Metro Line 2, also known as the East-West Metro and Green Line, is a rapid transit line of the Kolkata Metro in the Indian state of West Bengal. It currently consists of an operational section between Salt Lake and Sealdah, and will eventually connect Howrah by going underneath the Hooghly River, with an eastern extension also planned for Teghoria. It would consist of 17 stations from Teghoria (Haldiram) in the east to Howrah Maidan in the west, of which 11 would be elevated and 6 would be underground, with a total distance of 22 km. It is expected to derive a very high ridership since it will connect India's two largest commuter railway and long-distance railway terminals (Howrah and (Sealdah) along with two of its largest business districts (BBD Bagh and Salt Lake Sector V). It will also be connecting the industrial hub of Kolkata i.e. Howrah and the IT hub of Kolkata i.e. Sector 5. Line 2 has India's biggest underwater metro tunnel along with the deepest metro shaft. In the deepest metro shaft, Howrah metro station will be the deepest metro station in India, which will be 33 meters deep.The first phase between Salt Lake Sector V and Salt Lake Stadium was inaugurated by Union Railway Minister Piyush Goyal on 13 February 2020 and commercial services started from 14 February 2020. History The master plan had already identified the corridor way back in 1971. But the success of the Delhi Metro contributed to the sanction of the East – West Metro corridor, which will connect Howrah Railway Station with the Satellite City of Salt Lake. In January 2004, the Pacific Consultant International Group conducted a feasibility study for the line. The report proposed the route and tubular structures be under the Hooghly River. A new organisation called the Kolkata Metro Rail Corporation Limited (KMRC) was formed, which will be executing the operations of this Line, commencing construction in 2009. Of KMRC's eight directors, four each were from the state and central governments. The cost was being shared between the state government (30 per cent), the Union Urban Development Ministry (25 per cent), and the Japan Bank for International Cooperation (JBIC) (45 per cent). But as of 2011, after state government dis-invested from the project, most of the share of this project went to Indian Railways and with Japan Bank for International Cooperation (JBIC). The project is estimated