The zombie worm, Osedax. Credit: Adisha Pramod/Alamy In horror films, the most frightening threats are often the ones you cannot see. In the deep ocean, scientists are now facing a similar kind of unease, driven by the unexplained absence of a crucial species. That species is the zombie worm, formally known as "the bone devourer" Osedax. Its disappearance may signal deeper trouble ahead, including species loss and weakening ecosystems linked to long-term climate change. A Decade-Long Deep-Sea