In his book "Into Thin Air," Jon Krakauer relates the hazards that plagued some climbers as they attempted to reach the summit of Mount Everest. One of the expedition leaders stayed at the peak too long and on his descent became in dire need of oxygen. He radioed the base camp and told them about his predicament. He mentioned that he had come across a cache of oxygen canisters left by the other climbers but that they were all empty. The climbers who already passed the canisters on their own descent knew they were not empty, but full. They pleaded with him on the radio to make use of them, but it was to no avail. Harris was starved for oxygen but he continued to argue that the canisters were empty.