Gizmag »The Thames Tideway Tunnel is a $6.3 billion public-private partnership (P3) project to build a 16-mile tunnel to reduce the amount of sewage leaked into the River Thames from 1.4 billion cubic feet to 84.8 million cubic feet per year. Completion of the tunnel is expected by 2023 with tunnel boring scheduled to begin in 2017. This article tells the history of London’s current sewer system, explains the need for the Thames Tideway Tunnel project, and includes a video summarizing the project.