The Ganges is worshipped as a goddess, and many Hindus believe that this holy river cannot be polluted, yet it is one of the most dangerously contaminated rivers in the world. The Brothers meet the people who live with the extraordinary paradox of the Pure and the Poisoned – and they take their own holy dip in the Ganges with over 30 million people at the legendary Maha Kumbh Mela, the largest gathering of humans on earth.