India’s first underwater metro line likely to be ready by 2022

India's first underwater metro line in Kolkata, runs partly under the city’s famous Hoogly river is expected to be completed by March 2022.
Notably, this is India’s most expensive metro project. The new metro line, once operational is expected to carry about 9 Lakh people daily & commuters will take less than a minute to cross the underwater section. The distance currently takes about 20 minutes by ferry boats and more than an hour across the bridge.
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