India's first underwater Metro - Green line Metro - Howrah to Sealdah Metro - Train under the ganga

Noteworthy examples include the Thames Tunnel in London, the Seikan Tunnel in Japan, and the Channel Tunnel between England and France. Additionally, Prime Minister Narendra Modi inaugurated India's first underwater metro route in Kolkata, marking a significant milestone in the nation's infrastructure development.
The commercial services began from 15th March, after Prime Minister Narendra Modi had on March 6 inaugurated the Howrah Maidan-Esplanade section of Kolkata Metro's East-West corridor (Green Line), heralding India's first venture into underwater metro services.

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