Earth’s mysterious ‘deep biosphere’ may harbor millions of undiscovered species

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Scientists say the underground ecosystems are a “subterranean Galapagos” just waiting to be studied.

This unidentified nematode from the Kopanang gold mine in South Africa lives 1.4 kilometers below the surface.Gaetan Borgonie / Extreme Life Isyensya, Belgium

Life on Earth takes billions of shapes, but to see most of them you’ll have to dig deep below the planet’s surface.

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