An astonishing survival story in Australian cave diving: in November - December, 1988, a team of Australian and international explorers entered the massive Pannikin Plains Cave. Their expedition mission: to explore the extensive submerged cave system that lay 50 metres underground. Little did they know on the final day of their expedition a massive storm was heading their way. The effects were stunning: torrential rain and flooding caused tons of boulders and dirt to collapse in the cave entrance trapping the crew of divers underground. In this segment, two of the survivors, Chris and Sonia Brown, recount their dramatic survival and the subsequent rescue of the team of cave divers.