This document is a technical report detailing Sika's contributions to the Thames Tideway Tunnel project in London, UK. The Thames Tideway Tunnel, known as London’s 'Super Sewer', is a significant civil engineering project aimed at improving the city’s wastewater infrastructure. It spans 25 km beneath the River Thames and is designed to capture sewage overflow, reducing untreated discharges into the river. The report outlines the project requirements, including the need for durable and watertight structures capable of withstanding extreme geotechnical challenges. Sika provided a range of solutions, including concrete admixtures, waterproofing systems, and repair technologies, to meet the project’s specifications. The document also highlights the collaborative efforts between Sika and various stakeholders, ensuring compliance with strict durability and watertightness standards. Technical services offered by Sika Limited included mix design optimization and onsite troubleshooting, contributing to the project's successful execution.