The present ethnography on Sudanese mobility and immobility arose during a period spent at the French-Italian border of Ventimiglia while supporting people on the move in the current migration scenario. These encounters sparked my interest in exploring the motivations, narratives and practices of illegalised migrants as well as interconnections among places of origin, transit and arrival. The main research interest focuses on understanding how Sombok, the undocumented journey to Europe, takes place and breeds underground forms of mobilities, support networks and survival strategies. In doing so, particular interest is paid to the production, circulation and resilience of migratory knowledge in transnational networks and how that breed and sustain specific mobility practices and patterns. Of primacy to my research journey were the informants and friends I met, with whom I travelled, and spent periods of research and activism along the routes. Indeed, those people allowed me to share paths temporarily and collude with a community that moves underground, with close ties of complicity and collective practices.