reporter: faizan farooqi is their guide today. more than 750,000 people live and work in dharavi. no one knows the exact number. faizan: even my mother, if she has enough glass or plastic, she keeps on collecting it and then she sells it or she exchanges it with garlic. by doing this tour we try to expel the negative image of dharavi. we were born here in dharavi. so this is the place where we belong. and it's safe. and at the same time the company provides us part-time jobs so that we can study as well as we can look after the family. reporter: faizan earns a living by doing this job. he's studying to be a pharmacist. the slum-dwellers are proud of where they live. this shop owner plans to sell his bags under the brand name dharavi. mohammad: the tours are good for us. there are many slums in the world, but dharavi is unique because so many products are made here, so many people work here in so many different kinds of business, i don't think there's a slum comparable to dharavi in that sense. >> the annual turnover in dharavi is an estimated 600 million euros a year. the "be the l