California, Sequoia National Park—On July 24, 1956 Gerry Rule (16), while climbing with a companion on a steep talus slope above Hamilton Lake, slipped and fell some 40 feet. He was pinned under a large boulder all night, until a rescue party consisting of Park Rangers and trail crew employees, in company with a physician, could reach the victim. Rule slipped on slick rock and was critically injured. He was carried from the talus slope down to the edge of Hamilton Lake; and at the request of the physician, owing to the nature of his injuries, he was evacuated by helicopter to a nearby hospital.

Source: Thomas J. Allen, Superintendent, Sequoia and Kings Canyon National Parks.