India held a trial run of an underwater metro tunnel
India's first underwater metro tunnel has been given a trial run in Kolkata. The new line is scheduled to officially start operating in November 2023. The tunnel, called the East-West Metro Corridor, is 32 metres deep underwater.
See how many seconds it takes passengers to travel 520 metres and how much it cost to build the first underwater tunnel in this report from ANI, a TV BRICS partner.