Ankara: A major rescue operation in Turkey’s Taurus Mountains succeeded in bringing out an American researcher who fell seriously ill nine days ago at a depth of some 1,000 meters (3,000 feet) from the entrance of one of the world’s deepest caves. An experienced cave rescuer himself, Mark Dickey was assisted by teams of international rescuers who by Monday had gotten him to 100 meters (some 330 feet) from the surface. They brought him out early Tuesday. Here’s what to know about the caver and the rescue operation: