Follows Dr. Hazel Barton and Nancy Aulenbach as they travel through the caves of Arizona, ice caves of Greenland and underwater caves in the Yucatan, not only for sport and thrill, but also to search for discoveries that may lead to cures for human diseases.

Join Dr. Hazel Barton and Nancy Aulenbach as they travel to unique and forbidding ice caves in Greenland, underwater caves in the Yucatan, terrestrial caves in the Grand Canyon and other spectacular locations. For those compelled to push their limits in the world's most hostile environments, the risk of fatal danger and thrill of new discovery are the everyday factors that make cave exploration such an awe-inspiring experience.