The first phase of Mumbai Metro's Aqua Line from Aarey to BKC will be launched in December 2023, the Mumbai Metro Rail Corporation Limited (MMRCL) said on Tuesday. MMRCL had earlier informed that track laying work on the underground Metro Line-3 (Colaba-Bandra-SEEPZ) is complete by nearly 60 percent. The Colaba-Bandra-SEEPZ Metro Line will be Mumbai's first underground metro line.