New series. The survival challenge returns with two separate groups being abandoned at opposite ends of a remote uninhabited island in the Pacific Ocean, with the 16 Islanders facing extreme tropical weather, limited resources and environmental hazards. One team of castaways consists of professionals living off an average income of £100,000 a year, while the members of other earn below the UK national average wage. In the first episode, Bear Grylls drops them off in caiman-infested mangroves and deep water.