William Floyd Collins (July 20, 1887 – c. February 13, 1925), better known as Floyd Collins, was an American cave explorer, principally in a region of Central Kentucky that houses hundreds of miles of interconnected caverns within Mammoth Cave National Park, the longest cave system in the world. In the early 20th century, in an era known as the Kentucky Cave Wars, commercial cave owners and explorers in Kentucky entered into a bitter competition to exploit the bounty of caves for commercial profit from tourists, who paid to see the caves. In 1917, Collins had discovered and commercialized Crystal Cave on Flint Ridge (now part of the Mammoth Cave System but at the time an isolated cave). But the cave was remote and visitors were few. Collins had an ambition to find another cave he could open to the public closer to the main roads, and entered into an agreement with a neighbor to open up Sand Cave, a small cave on the neighbor's property. On January 30, 1925, while working to enlarge the small passage in Sand Cave, Collins became trapped in a narrow crawlway below ground. The rescue operation to save Collins became a national newspaper sensation and one of the first major news stories to be reported using the new technology of broadcast radio. The rescue attempt grew to become the third-biggest media event between the world wars.