Descend beneath the surface to witness Earth's hidden engines of life.
Explore the subterranean systems that shape our planet, from soil organisms and fungi to cave species adapted to darkness and scarcity. As scientists reveal how roots, bacteria, earthworms, and isolated ecosystems work together, each discovery makes the world below feel more intricate and essential. Sign up to see the unseen forces sustaining life on Earth.
Episode guide
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Frequently asked questions
Thousands of the world's best documentaries and factual programming — nature, history, science, technology, and biography — including exclusive Curiosity Originals like Secret Life Underground. Stream it all ad-free, anytime.
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Watch on the web, iOS and Android, Roku, Apple TV, Amazon Fire TV, Chromecast, Android TV, and most smart TVs. Start on one device and pick up right where you left off on another.
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