Tragedy and a troubling mystery have enveloped Mount Everest as the mountain’s climbing season reaches its peak. The bodies of three Indian climbers were retrieved Sunday amid reports that climbers were being jeopardized by the disappearance of oxygen bottles. The two situations have not been linked at this time. The bodies of Ravi Kumar, who died last weekend, and Paresh Chandra Nath and Gautam Ghosh, who died last year on the mountain, were brought down after being recovered by Sherpa guides near the summit.