MUMBAI, Feb. 23 -- The city's only underground metro corridor, the Aqua Line (Metro 3), which runs from BKC to Aarey Colony, has recorded a lukewarm response in the four-and-a-half months since its partial launch. Between October 7, 2024, and February 20, 2025, just 2.66 million passengers travelled on the Aarey-Bandra Kurla Complex (BKC) stretch-an average of fewer than 20,000 passengers per day or less than 100 passengers per trip....