Kiwi hunter Josh James and British chef Matt Tebbutt are dropped in Borneo's Kinabatangan River, surrounded by one of the most dramatic mangrove swamps in the world. This remote and complex ecosystem is home to many exotic animals; monkeys, tropical birds, deer, badgers and porcupines live alongside poisonous snakes and saltwater crocodiles. The swamp is claustrophobic and unfamiliar, and the team's relationship becomes tense when Josh loses Matt's only cooking pot in the river. Repeated hunting failures leave the men exhausted, but hunger forces them to adapt to the harsh terrain and start thinking like the locals.