Super sewer hits the halfway mark


tuneladora de Tideway tunnel

A cleaner River Thames is in sight for London after tunnelling on the super sewer reached the halfway mark. Ferrovial Agroman is delivering the central section of this vital new infrastructure for London in joint venture with Laing O’Rourke.

The giant machines digging the main super sewer tunnel – under construction to stop sewage pollution in the River Thames – have now tunnelled 12.5km of the 25km total length.

The tunnel now stretches as far west as Fulham and, eastwards, it has reached Blackfriars in the City of London – passing under 13 bridges including Albert Bridge, Westminster Bridge and Waterloo Bridge.

If the tunnel was a straight line, it would now be long enough to run the distance from Wembley Stadium in west London, to the London Eye in central London.

© Tideway

“I’m incredibly proud that we’ve reached the halfway mark on the super sewer. Reaching this point on schedule is testament to the success of the team, who have achieved a huge number of engineering feats. Once complete, not only will we have a cleaner river but there will be seven new areas of public space created along the Thames, transforming the embankment and creating new areas for Londoners and visitors to reconnect with the river.”

As well as the main tunnel, a 1km connection tunnel is also currently under construction in Wandsworth.

So far, the tunnels have been constructed using four tunnel boring machines (TBMs). Two more tunnelling machines are due to start working in east London this year, creating the eastern section of the main tunnel from Bermondsey to Newham, as well as a slightly smaller 4km connection tunnel in Greenwich.

Construction of the tunnels has seen three million tonnes of material transported by river, avoiding 340,000 HGV journeys and more than five million kilometres of road transport.


Configure newsletters and alerts.

Check your email address.

Newsletters and alerts

Thank you for subscribing!

We have just sent you an email to confirm your subscription.


The Ferrovial app provides instant access to all of the latest at Ferrovial; informative content, job offers and basic information for investors.