London's Victorian sewers were designed to serve 4 million people.
Now nearly 9 million people send a stinking amount of poo through London's sewers daily.
Did you know, London's population is estimated to increase to 16 million by 2160?
These sewers overflow into the River Thames when it rains.
Sewage is the last significant source of pollution in the river.
The Super Sewer is the solution to tackle these problems.
25km long and 7.2 metres in diameter, it will be completed in 2025.
The Thames Tideway Tunnel will protect the river for at least the next 100 years.