With narration by Liam Neeson and music by the Moody Blues, this IMAX film accompanies cave explorers Nancy Aulenbach and Hazel Barton on some unusual adventures, from underwater caves in the jungles of Mexico to ice caves on the plains of Greenland. As the two fearless spelunkers search the globe for clues about the Earth's past, they brave a variety of extreme environments for the sake of supporting science in this captivating documentary.

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