As one of two people who descended 260 feet down into the Glory Hole spillway at Whiskeytown Dam on Tuesday, Scott Colburn has gone where few others have gone before. A civil engineer with the U.S. Bureau of Reclamation, Colburn inspected the Glory Hole to make sure it was structurally sound. He was joined on his venture by James Hudleston, a mechanical engineer for the bureau. Colburn said they did not find any troubles with the concrete structure, which is an emergency spillway to prevent the lake from flowing over the top of the earthen Whiskeytown Dam, which the bureau operates.