在陽光照耀的世界底下，有一個由危機四伏的通道及黑暗組成的未知宇宙。1986年，國家地理學會的探險隊深入數百年來未受侵擾的地下新洞穴—新墨哥州的雷裘吉亞；枝狀石膏產始的美、粗糙的方解石柱和珠寶般的湖泊，都令人嘆為觀止！接著，在1972年的探險中，探險家們又巧遇連結馬默斯洞系和弗林特里奇洞的通道，發掘成為世界上最長的洞窟網。片中，洞穴探勘史上驚險的發現和傷痛的悲劇，也將重現眼前。
Embark on an extraordinary journey into the underworld of caves. Beneath our sunlit world lies an unknown universe of breathtaking caverns, treacherous passageways, and absolute darkness. Join a National Geographic expedition to document for the first time on motion-picture film, the splendors of the world's most exotic new cave: New Mexico's Lechuguilla. Relive the excitement of those cavers who in 1986, first penetrated Lechuguilla, which had lain undisturbed for millions of years. Marvel at the pristine beauty of gypsum chandeliers, gnarled calcite columns, and jewel-like lakes. Then, join the 1972 expedition that stumbled upon a passageway that linked the Mammoth and Flint Ridge Cave systems, creating the longest cave network in the world. And relive thrilling discoveries and heart wrenching tragedies in caving history. You'll view caves in a whole new light once you explore MYSTERIES UNDERGROUND.

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