" As Jamie Shreeve of National Geographic describes it, this required going through a passageway known as Superman’s Crawl, which is less than ten inches high and can be traversed only if you hold one arm tight against your body and extend the other above your head, like Superman when he is flying; then climbing up a vertical wall of jagged rock called the Dragon’s Back; and then, after a number of other twists and turns, finally squeezing through a passage that at one point narrows to only seven and a half inches wide, before reaching the Dinaledi Chamber in which the bones lie. "

― Eric H. Cline , Three Stones Make a Wall: The Story of Archaeology