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As climate change threatens to drive up rainfall, some experts suggest that London might have just flushed £4.5 billion down the toilet.
The 16-mile tunnel across central London will capture raw sewage that would have spilled into the river.
A map shows the route of London's new super sewer, with just months to go until the launch of the £5billion project.
The sewage treatment works at Horley seem to be crumbling, much like owner Thames Water itself
Three major companies released sewage on dry days in breach of their permits - BBC investigation.