Beneath the Earth's thin skin of rocks and soil, there's a marvellous inner world, full of surprises. Discover places you weren't supposed to see and secrets that were never meant to be revealed in this visually breathtaking collection. Remarkable footage from hidden locations beneath our feet will have you shaking your head in disbelief. Gain new insights into events past and present, natural phenomena and engineering achievements, thanks to the meticulous research undertaken by our production team. Prepare to be surprised, amazed, entertained and informed! Includes: Natural Wonders, Secrets and Treasures, Mastering the Underground World. 3 DVDs, 180 mins. SUBTITLES.