What's at the Bottom of the Mariana Trench?

The Challenger Deep sits nearly 11 kilometers below the surface of the Pacific. Sunlight gives up long before you get there, and the water above you weighs more than a thousand times what the air does at sea level.

Gary climbs into a small submarine and starts going down. Past the last light, past the animals that make their own glow, to a floor that only a handful of people have ever seen.

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