13th August, 9pm. National Geographic Channel UK
Deep below Mexico lies a mysterious cave packed with extraordinary giant crystals. Among the largest crystals ever found, they have been formed by on of the deadliest environments on the planet.
Combining extreme heat with unbearable humidity, without the use of specialised suits and equipment the conditions in the cavern would kill a man within minutes. Yet, despite the danger, scientists are trying to work out exactly how the glittering structures were created. Journey underground with the experts as they embark on a daring mission to try and unlock the secrets of the crystal cave.
Naica Mine
This is an amazing film, not particularly well shot but amazing content. The cave is a unique wonder of the natural world. Watch it if you can.
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