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The tunnel is a crucial link for the 16.4 km-long mass rapid transport (MRT) project being constructed by the Kolkata Metro Railway Corporation (KMRC) at an estimated cost of around Rs 9,000 crore.
"The KMRC team, including engineers from abroad, has completed the construction of India's first underwater tunnel under the Hooghly river," Satish Kumar, the MD of KMRC, said here on Friday.He said tunnelling from the Howrah end started in the last week of April and reached the Kolkata end on June 20.
Two tunnels, for onward and return journeys, have been bored 13 metre beneath the riverbed and 30 metre from the ground.
The operation of the East-West Metro Corridor in the first phase between Salt lake and Phoolbagan in the city will start next year. The first rake, built by BEML, will arrive in December this year, Kumar said.
"Full operation, till Howrah Maidan, will probably start from 2020 and a total of 17 trains will be deployed," he said.
KMRC has got all the necessary clearances from different agencies. Work on construction of the Esplanade station in the city's central business district has already started, Kumar said.
He said the operational headway for the full phase would be 2.5 minutes which is enough to handle the passenger load, particularly at Sealdah and Howrah metro stations.