A customer acceptance ceremony was held in June 2011 for a 6.25 m diameter Main Beam TBM that will dig India's Mumbai Water Tunnel.Some components of the TBM were partially assembled and shipped from the Robbins Shanghai, China manufacturing facility.The rest of the machine, including the main bearing, lube system, and back-up will be assembled on location using Onsite First Time Assembly (OFTA).TBM components will be lowered into the 109 m deep shaft using mobile and gantry cranes. The urban location will also require a Robbins continuous conveyor system with vertical conveyor for muck haulage to the surface and temporary storage at the site using a radial stacker.The 8.3 km long tunnel in basalt rock, for the Unity-IVRCL JV, will become part of the Mumbai water supply tunnel running from Kapurbawadi to Bhandup.