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The deep ocean remains one of the least explored places on Earth, stranger and less mapped than the surface of the Moon. Below a certain depth, sunlight disappears completely, and the water becomes crushingly cold and heavy. For centuries, scientists assumed that almost nothing could survive there. Modern expeditions have proved them wonderfully wrong. Robotic submarines with powerful lights have revealed creatures that seem invented by dreams: fish that produce their own glow, worms that feed near boiling volcanic vents, and jellies as delicate as glass. Many of these animals live without any sunlight, relying instead on chemicals rising from the seabed. Reaching them is extraordinarily difficult and expensive, and a single voyage can cost a fortune. Still, researchers argue that this hidden world deserves protection before we damage it, because we may be losing species we have not even discovered, along with clues about how life itself began.

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