We assessed the main Thames tunnel and participated in the planning phase to determine the preferred alignment. Our involvement extended to the Combined Sewer Outfall (CSO) selection process, site selection, traffic management, third-party asset protection, TBM selection, and soil disposal strategy. We were also responsible for the drawing deliverables for the main tunnel contract. Additionally, we engaged with the public to garner support for the project, interacting directly with the public at events such as the Mayor Festival at Tower Bridge and managing public comments on the Thames Water website.