El Soplao fantasy in the darkness, Creatic Publishing (2007). John Hill (between others), El Soplao, a unique cavity, Creatic Editions (2003). External links El Soplao official website Cantabrian Speleolo Club: discoverers of much of El Soplao More information on El Soplao News report on 110 Million year old amber containing trapped insects studied in El Soplaoe Photos of caving in El Soplao Manganese-Oxidizing Microbes Form Giant Stromatolites in Caves Prehistoric sites in Spain Archaeological sites in Spain Show caves in Spain Soplau