Unreported World: India

India may have a booming economy with a soaring stock exchange and a fast growing technology and services sector, but it's built on service of a much more unpleasant kind, as this week's Unreported World reveals. Reporter Ramita Navai and producer Siobhan Sinnerton travel through India exposing the horrific plight of the country's 170 million Dalits: literally "the broken people", and previously called "the untouchables"; who are at the bottom of India's caste system and are some of the most oppressed people on Earth.