Also known as Aqua Line of the Mumbai Metro Line 3 or the Colaba-Bandra-SEEPZ line, is a part of the metro system for the city of Mumbai, India of which construction has been initiated. When completed, the 33.5-km long line will be the first underground metro line in Mumbai. The metro line will connect Cuffe Parade business district in the extreme south of the city to SEEPZ in the north central with 26 underground and one at-grade station. The track width is standard gauge. The cost of this corridor is estimated at ?30,000 crore (US$4.3 billion).