Convinced that Crystal Cave would one day connect with caves in nearby
Mammoth Cave National Park, Brucker and other explorers formed the
Cave Research Foundation (CRF), to survey and study Mammoth Cave and other caves in the area. Through the late 1950s and 60s, CRF expanded the known reaches of Mammoth Cave and other caves under the adjoining Flint Ridge. In 1972, cavers found a connection between Mammoth Cave and the Flint Ridge Cave System. That discovery made Mammoth the world's longest cave, inspiring Brucker and Richard Watson to write
The Longest Cave. Brucker began working on the book
Trapped! The Story of Floyd Collins with historian
Robert K. Murray. Brucker had long been fascinated with the true story of
Floyd Collins, who was trapped in a cave in 1925 and could not be rescued, despite a massive effort that received national attention. The authors interviewed dozens of witnesses and studied hundreds of documents to uncover facts about the tragedy that were not previously known. As part of the research, Brucker and a small group of explorers even ventured into Sand Cave several times to the spot where Collins was trapped, In 1983, rival groups of explorers, including Brucker, discovered a connection between Mammoth Cave and nearby Roppel Cave, further expanding the known reaches of the Mammoth Cave system beyond the boundaries of the national park. Brucker later teamed up with James Borden to write ''Beyond Mammoth Cave: A Tale of Obsession in the World's Longest Cave''. In 2009, Brucker's fifth book and first historical novel was published.
Grand, Gloomy, and Peculiar: Stephen Bishop at Mammoth Cave is based on the true story of
Stephen Bishop, a slave who gained fame as a guide and explorer at Mammoth Cave in the 1840s and 50s. == Books ==