El Sidrón Cave (image) Spanish National Research Council (CSIC) Share Print E-Mail Caption Researchers are shown working in El Sidrón Cave in Asturias (Spain). Credit Joan Costa / CSIC Usage Restrictions The image may only be used with appropriate caption or credit. Share Print E-Mail Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.