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Can deeper reefs, an area known as the Twilight Zone, provide protection for big fish and other animals from threats such as pollution, overfishing and warming?
Descend into the twilight zone, where sunlight is scarce and every dive yields surprising discoveries.
Welcome to the twilight zone of the ocean, where the sun barely reaches and the fish have big eyes.
An extensive and comprehensive dive into the Twilight Zone, or deep coral reefs, of Hawaii.