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Myra Curio: "I've got some Muggle reports that might interest you. Something stinks in the sewers of London!"
Mathilda Grimblehawk: "Yes, Myra, that's normal."
Myra Curio briefs Mathilda Grimblehawk and her partner on the wizarding disturbances on the London sewers[src]

The London sewers are a system of underground infrastructure meant to transport sewage from houses and commercial buildings in London through pipes to treatment or disposal.[1]

At some point, there were Muggle complaints of 'wailing sounds' coming from plug holes and toilets; around the same time, wizard Philbert Chivers went missing and his wand was found at a sewer entrance. Suspecting there was some sort of magical creature in the sewers, Muggle Liaison Officer Myra Curio dispatched Department for the Regulation and Control of Magical Creatures investigators Mathilda Grimblehawk and her partner to look into the matter.[2]


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