The document summarizes a project to construct an underground water supply tunnel from Thane to Bhandup in Mumbai, India using a tunnel boring machine (TBM). The key points are: 1) The existing above-ground pipelines in Mumbai are over 100 years old and prone to corrosion, leaks and bursts. A new underground tunnel is needed to reliably supply the city's growing water demands. 2) An 8.3 km tunnel will be bored using a TBM from Kapurbawdi in Thane to Bhandup, reaching depths of 108m and 125m respectively. 3) Using a TBM allows the tunnel to be constructed much faster (18 months vs 5 years) through dense urban