Kidnappings. Guerillas. Impenetrable jungle. The Darien Gap is famous for many things. This 60-mile-wide swath of rainforest straddling the Panama-Colombia border has long been the stomping ground of drug traffickers and guerillas, most notably the left-wing FARC, who until 10 years ago were still conducting high-profile kidnappings of foreign travellers seeking to tackle this notoriously dangerous part of the world. Flash forward a decade and scientists working just outside the gap discovered that, while there were still occasional reports of violence, things were now relatively peaceful in the gap.