This article investigates the phenomena of “ghost nets”—fishing gear that has been abandoned or discarded. Starting in 2019 at Nissum Bredning in the western part of Limfjorden, Denmark, the article follows the NGO “the Danish Society for a Living Sea” and their efforts to engage with the issue. The article seeks to understand how ghost nets are tied to local haunting dynamics, namely the dismal ecological state of Nissum Bredning, and how the NGO brought it into national attention through activist approaches.