In early 1999, archaeologist Johan Rienhard climbed over 6,700 metres to the top of one of South America's highest volcanoes, Llullaillaco (pronunced yu-yi-ya-ko). The summit wad covered in freezing ice and snow,and the wind often reached speeds of up to 113 kilometres an hour. Rrinhard was there to find something very spacial. He dug down though the earth and rock beneath some ancient ruins and found a small chamber. Inside the chamber, he found what he was looking for: thefrozen mummies of three Inca children.