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Happened as dated, per the source[1]: "King Charles III officially opened the Thames Tideway[3] Tunnel on May 7, 2025."- Start
- May 7, 202590% CONFIDENCEsource
London's Thames Tideway 'Super Sewer' Officially Opens
King Charles III officially opened the Thames Tideway Tunnel, a 25km deep sewer built to stop billions of litres of sewage overflowing into the Thames each year.
- King Charles III officially opened the Thames Tideway Tunnel on 7 May 2025, travelling by ferry to Blackfriars and visiting the Thames Tideway Undercroft work site and the new Bazalgette Embankment[2]
- The 25 km tunnel was fully connected on 14 February 2025, when the last of 21 connections to the Victorian sewers was made after ten years of construction; 95 per cent of spills were being stopped[3]
- About 5,500,000 m3 of sewage had been captured, equal to 2,200 Olympic pools; the system links to the 6.9 km Lee Tunnel, with testing to finish later in 2025 before Thames Water operates it[3]
- Work began in 2016; primary tunnelling finished in 2022 and the tunnel connected to the Lee Tunnel in May 2024[3]
- Thames Water's CEO said it was built for four million people but now serves over nine million[3]
Cost $5B