For more than fifty years, Jacques Cousteau explored the Earth and its water system. Since 1943 when he and Emile Gagnan developed the first regulated compressed-air breathing device for deep sea diving, until his death in 1997, Captain Cousteau was a leading spokesman for protection of the underwater world and the global environment. Born in France in 1910, Cousteau served in the French navy from 1930 until 1957 before resigning to become director of the Musee Oceanographique of Monaco, a post which he held until 1988. As well as his films he wrote over 50 books which have been published in more than a dozen languages. This episode follows the crew on a breathtaking trip down Earth's longest river and reveals its fabled past and complex challenging present.