Region 1, widescreen; Dolby digital. Title from disc surface. "As seen on National Geographic Channel"--Container. Bonus program: Into the abyss.

"Three-quarters of Earth is an alien world, lying beneath the surface of the oceans. And although it encompasses over half of the world's species, we know more about the surface of Mars than the bottom of the ocean. It's only recently that science has penetrated this world, revealing extraordinary life forms and vast sweeping landscapes on a scale that defies imagination"--Container. Wild and hostile -- Surveying the ocean floor -- The floor of Monterey Canyon -- The center of an ocean basin -- Life in the slow lane -- Deep water coral -- Where tectonic plates meet -- A sharp step sideways -- The most extensive landscape in the world -- Deep sea vents -- Communities of creatures -- A huge flat plane -- Enormous mud volcanoes -- Teeming with life -- Subduction zones.