Bear Grylls enters the Guatemalan jungle to relive the experiences of three groups of jungle survivors. Mexican archaeologist Armando Anaya tells how his team were attacked by bandits as they excavated Mayan ruins, then stripped of their belongings and forced across a dangerous river. British John Gillatt scientist was lost and alone in the Malaysian jungle. Two Frenchmen, Loic Pillois and Guilhem Nayral, went on an expedition into the Amazon rainforest which turned into a gruelling 52 day ordeal. Bear Grylls experiences their toughest challenges and demonstrates the survival skills they used to stay alive, from river crossings, to tarantula hunting and lighting signal fires.