From the archives of Discovery: Watch as a rescue helicopter and a bird interact with earth's largest ecosystem, the ocean. Learn more about the ocean in this video.

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Join a compartment-by-compartment search of the Ehime Maru shipwreck.

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I Shouldn't Be Alive Director Crisipin Reece explains the difficulties of creating a snow storm on a warm sunny day on Mount McKinley.

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Dangers at sea abound. Capt. Keith Colburn talks about how he manages the madness.

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From the archives of Discovery: Watch as this rock climbing team navigates a path down a waterfall. Learn more about rock climbing.

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From the archives of Discovery: With assistants looking on from above, a team of rock climbers begins a long descent. Learn more about rock climbing.

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From the archives of Discovery: A rock climbing team reaches the bottom of a waterfall. Learn more about rock climbing.

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From the archives of Discovery: Explore these ancient cave dwellings, built into a canyon. Learn more about cave dwellings.

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