+Undersea refers to the vast, submerged realm beneath the [Ocean](/wiki/ocean) surface. It is a world of immense pressure, profound darkness, and incredible [Marine Life](/wiki/marine_life), largely unexplored by humans. This deep domain shapes much of Earth's climate and biodiversity.
+## See also
+- [Deep Sea](/wiki/deep_sea)
+- [Submarine](/wiki/submarine)
+- [Aquatic](/wiki/aquatic)
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