Inactive hydrothermal vent microbial communities are important contributors to deep ocean primary productivity. - Achberger AM; Jones R; Jamieson J; Holmes CP 2nd; Schubotz F; Meyer NR; Dekas AE; Moriarty S; Reeves EP; Manthey A; Brünjes J; Fornari DJ; et al. (Nature microbiology, 2024)