The number of passengers on the first day in this 4.8-km underground stretch between Howrah Maidan and Esplanade was 70,204, the official said. He said that out of these, 23,444 persons boarded at Howrah Maidan, while 20,923 passengers boarded at Howrah, which is the deepest metro station in India.

Jubilant commuters experience country's first under-river metro service

Kolkata Metro touched a milestone in April 2023, as its rakes completed a trial journey under the bed of river Hooghly through a tunnel 32 metres below water level for the first time in India.