India’s first underwater train in Kolkata is all set to be fully completed by 2023. Kolkata Metro Rail Corporation (KMRC) has made a way to pass under the Hooghly River. The East and West corridor will be connected via this twin tunnel over 500 m. The train will be 13 m below the Hooghly River. The tunnel is will be built with 1.4 m wide concrete rings, which will be part of the metro station. The tunnel will have hydrophilic gaskets to prevent water from entering the tunnels. The cost of this project is Rs.86 billion, roughly. Contact: Kolkata Metro Rail Corporation Website: www.kmrc.in