Look inside London’s new Super Sewer, an engineering marvel for rubbish and poo

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Look inside London’s new Super Sewer, an engineering marvel for rubbish and poo
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Below the streets of London lurks a new, enormous tunnel. It's job? Keeping poo out of the Thames.

Its purpose will be to carry a huge amount of sewage and wastewater, and if its impressive specs are any indication, it will do an excellent job at that stinky but important task. And in the process, if all works according to plan, it will result in a much cleaner Thames. Here’s what to know about this engineering feat beneath London.Like other cities, London has a sewer system that combines both rainwater runoff and sewage from homes and businesses.

Geall says that annually, an estimated 44 million tons of rainwater and sewage flow into the Thames. Deborah Leach, the CEO of the environmental group, provides a similar estimate for the total spillage: around 43 million tons. “Sewage is a huge component of it,” she says. “We’re not just talking the odd little bit of dirt here and there—it’s massive.”

And of course, pollution takes a toll on wildlife. “It’s just heartbreaking to see the fish kills coming down the river sometimes,” she adds. That typically happens in June, because sewage-eating bacteria in the water cause “clouds” of the river to become deoxygenated, she says. “They come to the surface—you can see them gasping to breathe.”

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