“We found that a big hole had been burned in the bottom of Worsley’s reindeer sleeping-bag during the night. Worsley had been awakened by a burning sensation in his feet, and had asked the men near him if his bag was all right; they looked and could see nothing wrong. We were all superficially frostbitten about the feet, and this condition caused the extremities to burn painfully, while at the same time sensation was lost in the skin. Worsley thought that the uncomfortable heat of his feet was due to the frost-bites, and he stayed in his bag and presently went to sleep again. He discovered when he turned out in the morning that the tussock-grass which we had laid on the floor of the cave had smouldered outwards from the fire and had actually burned a large hole in the bag beneath his feet. Fortunately, his feet were not harmed.”

— Ernest Shackleton, South