The construction of the 21 km long tunnel for the Mumbai-Ahmedabad Bullet Train project is progressing rapidly. A 394-meter long tunnel, called an Additionally Driven Intermediate Tunnel (ADIT), has been excavated at Ghansoli. The ADIT will provide direct access to the main tunnel during construction and emergencies. Its excavation, which took...
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six months and involved 214 controlled blasts, allows for the construction of another 3.3 km tunnel using the New Austrian Tunneling Method (NATM). This method allows for simultaneous tunneling from both sides. The 21 km tunnel will include a 7 km section under the Thane Creek intertidal zone, making it the first of its kind in India. The tunnel will have two tracks and will be constructed using Tunnel Boring Machines (TBMs) with 13.6-meter diameter cutter heads. Three shafts at BKC, Vikhroli, and Sawli will facilitate the construction of the 16 km tunnel using TBMs. The NHSRCL aims to complete the project by 2028, reducing travel time between Mumbai and Ahmedabad to three hours.