Back in the late 1800s this was a large limestone quarry area. Then in 1943, workers struck a spring that filled the quarry overnight! They had to leave equipment, tools, rail cars and rail track in the bottom of the lake. Today, divers enjoy the crystal clear water and hunt for underwater remnants of the old mining operation. There is also an old school bus, various statuary and other interesting things for divers to explore. They were placed there to add interest to the dive. Huge Paddlefish, that can be as long as 7 feet and 200 lbs, also inhabit the lake! We saw 2 about 5 foot long. We hiked what looked like a clearly marked trail on the map. Not so much! We made a wrong turn and passed the Observation Tower twice…. Oops! We were “geographically challenged” ( lost). There are so many side trails not on the map. A fellow camper, Mike, rescued us with his golf cart just about the time we had given up all hope 😉 He saw us puzzling over our trail map. That was a wild ride up and down those inclines and twists on that golf cart. What a great hike even with the detours and problems.