How London Built a 25-Kilometer Super Sewer Beneath the City

Beneath the streets of London lies a massive 25-kilometer tunnel built to protect the River Thames from sewage pollution. London's Thames Tideway Tunnel, known as the Super Sewer, captures storm sewage from the city's aging Victorian sewer network and carries it toward treatment instead of allowing it to overflow into the river. Built up to around 67 meters underground, the tunnel is about 7.2 meters wide and uses massive tunnel boring machines, deep shafts, gravity, and existing sewer infrastructure to move millions of cubic meters of wastewater. But this isn't just a tunnel. It's a hidden piece of infrastructure designed to help protect the Thames for at least 120 years. Chapters 00:00 — London's Hidden Super Sewer 00:43 — Why London Needed a New Sewer 01:25 — Why London Needed a Second Sewer 03:07 — A 25-Kilometer Tunnel Beneath London 04:38 — The Machines Beneath London 06:21 — How London's Super Sewer Actually Works 08:07 — Where the Sewage Finally Goes 09:33 — Building for the Next 120 Years 10:51 — The Infrastructure Nobody Sees Subscribe for more documentaries about mega projects, engineering, infrastructure, technology, and the hidden systems that keep modern cities running. #London #SuperSewer #ThamesTideway #TidewayTunnel #LondonInfrastructure