The Economic Times

India's largest tunnel boring machine begins excavation in Vikhroli for Mumbai-Ahmedabad bullet train project

According to a press release, of the total 21 km long underground tunnel section, 16 km between Sawli (Ghansoli) and Bandra Kurla Complex (BKC) in Mumbai will be constructed using Tunnel Boring Machines. The remaining 5 km section has already been completed using NATM.