In the deepest, darkest parts of the ocean, far below where visible light can reach, swims one of the strangest animals on Earth: the deep sea jellyfish . These mysterious creatures thrive in a zone so dark and pressurized it's nicknamed the midnight zone.

Unlike their shallow-water cousins, deep sea jellyfish are adapted to extreme conditions.

They drift silently through the ocean depths, often glowing with bioluminescence, a light show powered by chemistry. These flashes help attract prey or confuse predators in a place where sunlight never penetrates.

What Is the Giant Phantom Jellyfish?

One of the largest and rarest deep sea jellyfish is the giant phantom jellyfish, or Stygiomedusa gigantea . With a bell that can stretch over 3 ft (1 m) wide and four long, ribbon-like arms reac

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