noun
a deep oceanic zone that lies below the bathyal zone, characterized by extremely high pressure, low temperatures, and total darkness
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The abyssal zone is the deepest part of the ocean, reaching depths of over 6,000 meters.
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Diving into the abyssal zone is like entering another world altogether.
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Exploring the abyssal zone is like going to the ocean's ultimate chill spot.
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Her mind felt like an abyssal zone, dark and unknowable.