HomeBBC Top NewsInside Britain's biggest sewer under London's River Thames

Inside Britain’s biggest sewer under London’s River Thames

For decades London’s Victorian-era sewers have discharged raw sewage into the River Thames after heavy rain.

But that could be about to change, thanks to a vast tunnel that’s been built underneath the river.

Seven metres wide, 25km long and costing nearly £5bn it’s designed to divert sewage to a treatment plant in east London.

Our environment correspondent Jonah Fisher was given a rare opportunity to ride a bike along the tunnel before it fills up with sewage.

Producer: Sophie Woodcock

Filming and editing: Kevin Church

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