America's Deepest Cave
May 6, 2007 4:20 PM Subscribe
Another World In the New Mexico desert sits an unremarkable sinkhole. At the bottom of the 90-foot pit, a piece of stainless steel culvert juts up, sealed by an airlock. If you can get the National Park Service to unlock the door, you've reached the Holy Grail of American caving, Lechuguilla Cave.
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