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It's pitch black, toxic gases bubble up from deep below, sulfuric acid drips from above, and carbon monoxide fills the air. It's not a scene from a horror movie, but the interior of a beautiful, but treacherous, cave. Explore the beauty and danger found in some of the world's most exotic caves as NOVA explores dark recesses, off limits to all except researchers. Gather your courage and discover an astonishing universe few will ever experience.
