The underwater metro tunnel connects twin cities Kolkata and Howrah, divided by the Hooghly River
Built 13 meters below the Hooghly River, the underwater metro tunnel is 520 meters long
The train will run at a speed of 80 km/hr in the underwater tunnel
The metro will cover the half-kilometre stretch under the Hooghly in about 45 seconds
It has the deepest metro station in India, the Howrah metro station at 33 metres below ground level
The tunnel across the river was built in a record 66 days
The tunnel has been designed for a lifespan of 120 years
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Saudi Arabia's first male robot ‘inappropriately’ touches female TV reporter