Bluespring Cavern TimeLapse

Bluespring Caverns is a cave system located in Lawrence County, Indiana, 80 miles south of Indianapolis. The cave system is a karst and river type cave formation and drains a 15 miles² (38.8 km²) sinkhole plain. The cave contains 21 miles of surveyed passages and is most notable for having the longest known subterranean river in the United States with approximately 3 miles of navigable river.