North Korea's recent nuclear test has received condemnation from around the world. But North Korean residents themselves make of it? Despite the difficulties of investigating inside a closed society like North Korea's, a Japanese magazine called 'Rimjingang' managed to get a glimpse behind the facade, helping a few brave people to film inside North Korea. BBC correspondent Roland Buerk went to Osaka to meet the man behind the project, Jiro Ishimaru.
