While the metros in India currently run above and under the ground, they will soon also operate underwater, marking a first for the nation.
By 2023, Kolkata will be the first city in India where metros will operate underwater along with its usual routes on the surface and underground. This futuristic underwater metro will be an Indian version of Eurostar's London-Paris corridor.
The metro will cut down on travel time tremendously for commuters. The Kolkata Metro Rail Corporation (KMRC) is responsible for building the project. The metro line will link Howrah to Salt Lake via Central Kolkata.