There's a massive "super sewer" tunnel project going on since 2016. https://www.tideway.london/the-tunnel/ https://www.tideway.london/the-tunnel/ https://www.

There's a massive "super sewer" tunnel project going on since 2016. https://www.tideway.london/the-tunnel/ https://www.tideway.london/the-tunnel/ https://www.youtube.com/watch?v=wJ3ipd9pDCA https://www.youtube.com/watch?v=wJ3ipd9pDCA