London’s original 150-year-old sewage system was built for less than half its current size. As a result, millions of tonnes of raw sewage spills, untreated, into the River Thames each year.

While building the new sewage tunnel we use barges to remove unwanted material which saves using 100 lorries per day meaning the CO2 levels are kept down, this is due to a barge being able to move 1000 tonnes of material each time. This allows us to work in a more environmentally friendly manner reducing the impact on the communities surrounding the project.