Five friends are enjoying a weekend fishing trip on one of Africa’s wildest and most remote rivers when a hippo suddenly attacks their boat. They’re left fighting for their lives in one of the world’s most crocodile-infested rivers. Three of them manage to reach a sandbank in the middle of the river but the current’s too strong for them to make it to the shore. The group’s only chance of survival is if one of them can make it to the riverbank and go for help.

Saturday 25 August 2007, Channel 4