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This article focuses on the Schengen Information System (SIS II) – the largest data infrastructure supporting police cooperation and border controls in the European Union. Through the SIS II, national authorities exchange information about individuals and objects, and this across national and institutional boundaries. Yet, the SIS II does not always perform as anticipated in its design scripts. Following common threads about  infrastructural politics  across Science and Technology Studies, political geography and critical security studies, we explore  fragility  and  maintenance  as being intrinsic to the functioning of data infrastructures and crucial sites of governance. We show how the SIS II is kept under continuous control to operate as a controlling data infrastructure. This article contributes to a critical inquiry into the datafication of border controls by interrogating how data acquire the status of allegedly credible and accurate information. Ultimately, this approach pinpoints the inherent fragility of seemingly mighty data infrastructures and casts a light on those actors and processes that sustain, through maintenance, contemporary digital borders.

Controlling the Schengen Information System (SIS II): The Infrastructural Politics of Fragility and Maintenance