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Tideway is upgrading London’s sewer system to cope with its growing population.

Our 25km tunnel will intercept, store and ultimately transfer sewage waste away from the River Thames.

All six Tunnel Boring Machines have now finished their drives marking the completion of the tunnelling phase of the project. 

What happen’s London’s sewers when it rains?

Super Sewer updates

Track our tunnelling machines
Track our machines

Track our tunnelling machines

See where our tunnelling machines have got to under London.

Our Locations

Our Locations

Find out more about our site locations along the tunnel line.