Work began on the super sewer in 2016 and the project is expected to cost £3.8 billion, Tideway said.So far 6km of of the 25 kilometer long super sewer tunnel has been built, with four TBMs in the ground, while 1.6 million tonnes of rubble and debris have been removed by river, saving 100,000 lorry trips,

https://www.itv.com/news/2019-09-12/new-pictures-reveal-work-on-london-super-sewer/