Ocean Depths.

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Diagram of the ocean depth zones from sunlight to the hadal trenches
Into the Dark: A Journey Through the Ocean's Depth ZonesFrom sunlit surface to the hadal trenches: the ocean's depth zones, the creatures that glow in the dark, and why the deep sea matters to everyone.
Whale skeleton on the seafloor surrounded by deep-sea scavengers
Whale Fall: How a Single Death Feeds the Deep for DecadesWhen a whale dies and sinks, it creates an entire ecosystem on the seafloor. The stages of a whale fall and the species that depend on them.
Deep-sea submersible with lights and manipulator arm near the seafloor
Machines for the Abyss: How Submersibles and ROVs Explore the DeepCrewed submersibles, ROVs and autonomous vehicles: the machines that let us reach the deep sea, and the engineering that keeps them intact.
Diagram of increasing pressure with ocean depth and adapted animals
Living Under Pressure: How Deep-Sea Animals Survive the CrushWhy pressure increases with depth, what it does to gas and tissue, and the adaptations that let animals thrive kilometers below the surface.