In 1858, London's Thames reeked so badly that Parliament fled — and the crisis accidentally gave birth to the modern sewage system that ended cholera.
By the mid-19th century, London's population had tripled to three million, but its sewage system hadn't kept up. Over 360 sewers and roughly 200,000 cesspits discharged raw human waste directly into the River Thames, turning it into an open sewer running through the heart of the city.
In the summer of 1858, a brutal drought and temperatures reaching 48°C caused the Thames to shrink and concentrate its sewage into thick, reeking banks of filth. The resulting stench was so overwhelming that the era became forever known as 'The Great Stink.'
Parliament, which sat directly on the Thames, was effectively forced to adjourn. Curtains were soaked in lime chloride in a desperate attempt to mask the smell. Queen Victoria abandoned a planned pleasure cruise along the river within minutes of departure.
Victorians at the time believed in 'miasma theory' — the idea that diseases were spread through foul-smelling air. Three catastrophic cholera outbreaks had already killed over 31,000 Londoners, but officials still hadn't connected them to the contaminated water supply.
The crisis finally forced Parliament to act. On August 2, 1858 — just 18 days after the worst of the stench began — legislators passed a bill authorizing £3 million to overhaul London's sewage infrastructure. Necessity had achieved what decades of public health advocacy had failed to do.
Civil engineer Joseph Bazalgette designed a revolutionary new system: 1,100 miles of street sewers feeding into 82 miles of main intercepting sewers that carried waste eastward, away from the city. Construction required 318 million bricks and took until 1875 to complete.
The project also created London's famous Thames Embankments — the Victoria, Chelsea, and Albert embankments — which not only contained the new sewers but reclaimed land and relieved road congestion, transforming the look of central London.
The results were dramatic. Cholera vanished from London almost entirely after the system was completed. An 1866 outbreak was confined precisely to areas not yet connected to Bazalgette's network — definitively proving that cholera spread through water, not air, and vindicating the long-ignored theory of physician John Snow.
Historian John Doxat wrote that Bazalgette 'probably did more good, and saved more lives, than any single Victorian official.' He was knighted, and a monument on the Victoria Embankment bears the inscription: 'He placed chains upon the river.'