We thought it was just another sinkhole. But after dropping a GoPro 20 feet down, we saw something shocking — a hidden passage no one had entered before. What began as a simple test turned into a full ...

Watch a GoPro camera fall from over 1100 meters in this dizzying video. The camera falls from a skydiver (who was unharmed) and plummets down towards the earth. The camera spins rapidly as it falls, ...