Frequently, when there are mine cave-ins, one or more miners are entombed for shorter or longer periods, during which time they are without food and often without water. Their survival until they can be rescued depends not upon food, but upon air. If the oxygen supply is exhausted before rescuers reach them, they perish, otherwise, they survive days without food. The entombed miner is like the animal buried for days and weeks under a snow-drift. He is able to go for prolonged periods without food and survive, just as are these animals.