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When completed, the 33.5 km (20.8 mi) long line will be the first underground metro line in Mumbai, with 27 underground stations and one at-grade station.The line will run from Navy Nagar in the far-south of Mumbai to Aarey Depot in the north-centre, and will include connections to other metro lines, monorail, suburban rail, inter-city rail, and Mumbai's International Airport.Line 3 is expected to reduce road congestion, and to reduce the load on the Western Line between Bandra and Churchgate