![](https://ichef.bbci.co.uk/news/1024/cpsprodpb/D394/production/_95646145_p050427d.jpg)
thrown into the Thames from the Victorian sewers not handle 1.2 million tons of untreated waste water this year.
Even a few millimeters rain enough to the old tunnel and any surplus goes to saturate into the river.
Work has already begun on a new super-sewer, which is large enough to cope with the growing population of the city.
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