The project promoter’s annual report and accounts reveal that the project is now 63% complete with 21km of tunnel constructed at the end of financial year 2020/21, “demonstrating marked progress towards completion of the underground phase of works”, writes New Civil Engineer:

https://www.newcivilengineer.com/latest/tideway-cost-uncertainty-remains-despite-year-of-solid-construction-progress-on-super-sewer-05-07-2021/