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Mumbai, which is located on the western coast of India, is the capital of Maharashtra state. It is home to Hollywood, the centre of Hindu movie industry, and the film “Slumdog Millionaire” was based there. Poor people have to live in slums. In the slum, people have to live with many problems. People have to go to the toilets in the streets and there are open sewers. Children play among sewage wastes and doctors deal with 4,000 cases of death a day because of a lack of hygiene.
Next to the open sewers are water pipes that can crack and take in sewage. Dharavi slum is based around this area. There are toxic wastes in the slum, including hugely dangerous heavy metals. Dharavi is made of 12 different neighbourhoods, and there are no maps or road signs. The further you walk into Dharavi from the edge, the more crowded the area becomes. People live in very small slums, often with many members of their extended families.

What is one of the significant problems faced by people living in the slums of Mumbai, as described in the passage?