Guy Astruc should have been concentrating on the road as he drove along the icy edge of the Lot River in southwestern France. But Astruc is a spelunker, always on the lookout for potholes to pop into. To him, the little frost-free spot he saw in a limestone cliff suggested a cave entrance that had become plugged up. He stopped to probe the spot with a crowbar. Stones and dirt caved in; warm air whooshed out. Suddenly Astruc was staring into a narrow tunnel. "I was alone," he says, "afraid to go in very far, or stay very long."
Stomach Crawlers. Astruc...
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