The mimic octopus was only discovered in 1998 — demonstrating how unknown even shallow tropical waters remain.
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Some deep-sea octopuses brood their eggs for years.
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The Dead Sea is 10 times saltier than the ocean.
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Deep-sea coral reefs exist without sunlight.
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Some fish use countershading to camouflage in water.
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The Pacific Ocean contains numerous coral atolls.
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More than 70% of Earth's oxygen is produced by marine plants, primarily phytoplankton.
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Hurricanes gain strength from warm ocean water.
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Some deep‑sea fish create their own light.
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