In response to distant suffering, global civil society is being consumed by a generalized witnessing fever that converts public spaces into veritable machines for the production of testimonial discourses and evidence. However, bearing witness itself has tended to be treated as an exercise in truth-telling, a juridical outcome, a psychic phenomenon or a moral prescription. By contrast, this article conceives of bearing witness as a transnational mode of ethico-political labour, an arduous working-through produced out of the struggles of groups and (...) persons who engage in testimonial tasks in order to confront corresponding perils produced by instances of situational or structural violence; it is the work of witnessing, the normative and political substance generated through the performance of patterns of social action, which matters. Using Celan's allegory of the poem as a message in a bottle, I consider bearing witness as a web of cosmopolitan testimonial practices structured around five dialectically related tasks and perils: giving voice to mass suffering against silence ; interpretation against incomprehension ; the cultivation of empathy against indifference ; remembrance against forgetting ; and prevention against repetition. (shrink)