The Mumbai Metro Rail Corporation Limited has received its first Tunnel Boring Machine (TBM), which will be used to drill twin tunnels for the 33.5-km Colaba-Bandra-SEEPZ Metro-3 line. MMRC will receive 16 more TBMs over the next two years. The TBM operator will reportedly sit in an air-conditioned cubicle within the machine, which also has its own sanitation system.