In 1960, four college students entered what was then an unpromising opening beneath a little-known limestone rock bridge—an opening that soon led to one of the state’s most stunning discoveries. This tour recreates that first exploration of Discovery Cavern, guided only by handheld lanterns. Unlike the original explorers, who climbed through mud and over rocks, guests walk paved paths with handrails. Along the way, they hear the story of those first discoverers who, on their fourth expedition, uncovered what would become the largest cavern in Texas.