Kolkata Metro's Underwater Tunnel To Be 45-Second Experience For Commuters
India's first underwater tunnel, being built under the Hooghly River as part of the East West Metro Corridor, will be a blink-and-you-miss-it experience for passengers as trains will cross the 520-metre stretch in just 45 seconds.
France General Hooghly River West Bengal Howrah Maidan Sailesh Kumar National Fire Protection Association
Source: ndtv.com