Making London healthier

A large underground system of pipes that carries away sewage

To make something good exist again

What causes the biggest problems for the maintenance teams?

What does 90% of the liquid in the sewers consist on?

To flow quickly and in large amounts

Nauseous

Beneath

The arrival of the ... in people’s bathrooms did a lot to improve

hygiene in the home, but it was a disaster for the city.

... is dangerous because it blocks

tubes.

Rats are less common in the sewers.