Two cavers from the Australian National University were rescued from the Jenolan Caves west of the Blue Mountains after being trapped underground for nearly 12 hours.
The man was stuck in a hole the size of a construction helmet - so narrow that it's known to cavers as a "squeeze". One arm was ahead of him and the other behind him.
He was the fifth in a party of six to go through the hole so when he got stuck the woman caver behind him was also stuck underground. They were freed after rescuers drilled away some of the rock holding the caver.