It is the Country's first Underwater transportation tunnel , the section has the deepest Metro Station in India , the Howrah Metro Station at 30 Meters . (Image : gettyimage )
The tunnel beneath the River Thames in London . It is the first tunnel known to have been constructed successfully underneath a navigable river . (Image : gettyimage )
The Mass Transit Railway (MTR) is a major public transport network serving Hong Kong. It consists of heavy rail, light rail, and feeder bus service cantered on a 10-line rapid transit network serving the urbanized areas of Hong Kong . (Image : gettyimage )
It is a 13.5 km long undersea railway tunnel in Istanbul, Turkey, beneath the Bosporus strait, linking Europe with Asia. It consists of two single track tunnels with three underground railway stations .The tunnel is the deepest immersed tube tunnel in the world. (Image : gettyimage )
It s a 53.85 km (33.46 mi) dual-gauge railway tunnel in Japan and is the world's longest undersea tunnel and the second-deepest transport tunnel below the sea level . (Image : gettyimage )
It is an underwater rail tunnel that carries Bay Area Rapid Transit's four transbay lines under San Francisco Bay between the cities of San Francisco and Oakland in California. (Image : gettyimage )
also known as Karnaphuli Tunnel, is an underwater expressway tunnel in the port city of Chittagong, Bangladesh under the Karnaphuli river. The Bangabandhu Tunnel is the first underwater road tunnel in South Asia . (Image : gettyimage )
It is also referred as the Chunnel is a 50.46-kilometre undersea railway tunnel, that connects Folkestone with Coquelles beneath the English Channel at the Strait of Dover . It is the only fixed link between the island of Great Britain and the European mainland. (Image : gettyimage )