MEMBER REVIEW: This Readers Digest video is a lot like the magazine: three hour long videos containing material from other productions, with new writing and narration that supposedly ties it all together. It is not bad, but you would be better served watching the original materials. The hodgepodge of subjects and meandering narration sorta ties things together, but I was left wanting more in-depth about each subject. And the level is high school at best, as they are trying to reach the widest audience so it is pretty bland and generic. They do provide a wide overview, but you can get better elsewhere. DESCRIPTION: Beneath the thin skin of rocks and soil of the Earth, there is an inner world, full of surprises. Discover places you were not supposed to see and secrets that were never meant to be revealed. Marvel at hidden treasures, natural wonders, and the extraordinary ways we are mastering the underground worlds of our planet.