A group of Hendersonville hikers were lucky to escape with their lives Wednesday afternoon when they were trapped by rapidly rising water below Great Falls Dam at Rock Island.The incident began late Wednesday afternoon as the group of hikers were exploring the gorge several hundred yards from the dam. At some point, TVA began releasing water and the water level in the gorge began to quickly rise. TVA officials said they sounded the alarm and flashed the warning lights in the gorge for over 30 minutes before opening the first of the flood gates.