Welcome to the alien world of the deep! -- The epipelagic, or sunlight, zone -- The mesopelagic, or twilight, zone -- The bathypelagic, or midnight, zone -- The abyssopelagic zone, or the abyss -- The hadalpelagic zone, or the trenches -- Deep-sea environment -- Deep-sea survival tactics -- Goodbye! -- Want to know more? -- Index of sea creatures.
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