While Longhorn Cavern State Park has provided shelter for millennia, thick layers of mud and debris left most of the limestone cave system inaccessible to visitors. Enter Company 854. After removing 2.5 tons of silt and bat guano, Civilian Conservation Corps enrollees mapped passageways and installed two miles of electric lights. Aboveground, they constructed facilities using stone quarried onsite. Produced by the Jamieson Film Company for the Texas State Parks Board, this 1950s promotional film segment explores the park's many natural wonders.