In slum areas, where more than half of Mumbai lives, an average 81 people share a single toilet. In some places it rises to an eye-watering 273. Even the lowest average is still 58, according to local municipal authority figures.

Unsurprisingly, it is still common to see people squatting by roads and railway tracks or along the coast, openly defecating in the city that drives India's economy and where some of the world's richest people live.