abyssal zone
layer of the pelagic zone of the ocean; the deeper part of the midnight zone which starts in the bathypelagic waters above, the area below the abyssal zone is the sparsely inhabited hadal zone
en-US/əˈbɪsəl ˈzoʊn/
en-GB/əˈbɪsəl ˈzəʊn/
layer of the pelagic zone of the ocean; the deeper part of the midnight zone which starts in the bathypelagic waters above, the area below the abyssal zone is the sparsely inhabited hadal zone