Spanish herpetologists Juan Timms and Jairo Cuevas have embarked on a thrilling expedition across Bolivia in search of the most venomous snakes in this remote country. They will carry out an intense search during which they will capture some of the most dangerous snakes on the South American continent. The main goal of the expedition will be to discover a new species unknown to science, a large pitviper of which they have only seen a single photograph. This species has not been classified yet. It will be tracked down and filmed alive for the first time.