prof. schmid: it is a little far reaching to say a burial. there is just no other possibility they could go in because if they went in on their own, other animals should have then there also, but they only found about 1800 fragments of only hominids, and no other memo -- no other mammal was there, so we have to find an explanation for this, and the only thing that makes sense is disposal of the dead. sarah: tell us more about the excavation process. prof. schmid: the last part of the entrance is a vertical shaft of about eight meters and 18 centimeters in diameter, so only very slim people can go in, so we had archaeologists who were virtually underground and could go through the shaft. they were guided by television. they brought up the fossils to be tested. it was so astonishing that we only saw these hominid fossils. sarah: looking at these pictures, that is definitely not a job for someone who is claustrophobic. i understand you found 15 individuals so far, ranging from infants to the elderly.