This episode takes Simon through Bangladesh and on a perilous covert journey into Burma, where western journalists are banned. In Bangladesh Simon sails down the mighty Padma River and visits fishermen who use trained otters to drive fish into their nets. Further on he sees the river banks crumbling before his eyes - increased river erosion is thought to be caused by global climate change - and in the capital Dhaka he meets some of the millions of child workers. From North East India, Simon treks through jungles and across rivers into Burma to meet the Chin people - an ethnic group who are brutalised and oppressed by the Burmese government. After travelling around the Tropic of Capricorn and the Equator, this series completes Simon's trilogy of journeys exploring the amazing tropics region with his toughest, longest, most ambitious challenge yet.

• Simon Reeve