After passing the thermocline, in which water temperature decreases rapidly over short distances, temperature falls into a sort of constant-looking decline. However, looking at the graph, it looks almost asymptotic. I've not been able to find a chart measuring water depths below 10,000m, so I'm unable to tell for sure. What happens to water temperature as you dip to truly extreme depths, of which likely do not exist on Earth, like 10,000km? Would water temperatures ever reach absolute zero?