Turbulent water motions are important for the exchange of momentum, heat, nutrients, and suspended matter in the deep sea. The shape of the marine topography influences most water turbulence via breaking internal waves at critically sloping seafloors. In this paper with co-author Henk de Haas, the concept of critical slopes is revisited from a global internal wave turbulence viewpoint using seafloor topography and moored temperature sensor data. The potential robustness of the seafloor–internal wave interaction is discussed.