These aerial shots show giant shafts being bored in the banks of the Thames as part of the £4.2 billion super-sewer project.
A helicopter was hired to capture images of the work needed for the 16-mile Thames Tideway tunnel, due for completion in 2024.
The main image shows works on Albert Embankment, near the MI6 building in Vauxhall, with a barge ready to remove excavated spoil.
Each hole is about 50ft wide and more than 160ft deep. In total 22 shafts will link London’s existing sewage network to a new tunnel.
This weekend, residents are planning to protest over fears of dust pollution at another site, Chambers Wharf in Bermondsey, ahead of a continuous 36-hour pour of concrete that is needed to reinforce the underground structure.
The sewer is being built to stop 40 million tonnes of raw sewage overflowing into the river annually.