Episode 4

Wildlife adventure series following a team of explorers in the heart of the tropical island of Borneo - a lost world of unexplored jungle protected by a fortress of impenetrable mountains. Their aim is to find evidence that will help the area to be preserved forever. One team is hunting for bats, snakes and giant spiders, whilst the other finds extraordinary cave paintings made by an ancient rainforest people. Then the climbers set out on their greatest challenge yet - to drop into an enormous collapsed chamber lying at the top of a jungle mountain.