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The deep ocean refers to the vast, dark, and largely unexplored regions of the Earth's oceans that lie beyond the reach of sunlight. This mysterious realm is characterized by extreme pressures, frigid temperatures, and unique ecosystems that are home to a diverse array of deep-sea creatures. The deep ocean is considered to begin at depths of around 200 meters and extends down to the ocean floor, which can reach depths of over 11,000 meters in places like the Mariana Trench. Despite its remote and inhospitable nature, the deep ocean plays a crucial role in regulating the Earth's climate and supporting marine life through processes such as nutrient cycling and carbon sequestration.