Caves. Their landscapes and ecosystems are as diverse as the planets which align our solar system. Travel around the world to explore this mysterious, and still vastly uncharted, subterranean world. Audiences will uncover an abundance of natural, ecological, and archaeological jewels which lay hidden within the worlds deepest, darkest and most astonishing caves. Embark on the adventure of a lifetime through tight passageways, down deep vertical shafts, and across searing cavern floors. Journey from the watery Caves Branch of Belize to the frozen kingdom of Eisriesenwelt, from the gargantuan Sotano De Las Golondrinas to the indignant fires of the Hawaiian Lava Tubes. From mystical Mayan ruins, to awe inspiring crystalline chambers, viewers will witness a collection of natural wonders as far as the eye can see... all in a world apart from our own.