India's first Underwater Metro

About India's first Underwater Metro:

• It is a part of Kolkata Metro’s East-West Corridor.
• It passes under the Hooghly River in the city's northeast, with the tunnel 13 meter below the riverbed and 33 meter below ground level.
• Total length of the tunnel: 520 meter
• It forms part of the 4.8 kms underground section from Howrah Maidan to Esplanade
• Once this stretch is open then Howrah will be the deepest Metro station (33 meters below the surface) in the country.
• The metro is expected to cover the 520-meter stretch under Hooghly river in 45 seconds.
• The tunnel will have exists for emergencies like earthquakes.