The Bushmen's drill rig loses a vital pin, forcing 74-year-old Les to undertake emergency repairs four meters in the air and Rod struggles to maneuver their 4 ton digger across treacherous mud deep underground. The Digi Diggers flooded mine wall collapses as Josiah and Lisa attempt a new method of extracting Yowah nuts from the mine wall with a high-pressure hose after they destroy precious opal with a pick. The Mooka Boys take on an old timers' mine for their last dig of the season. Matt is hit with a crippling asthma attack working in a pocket of bad air and an unstable wall collapses on Cozza as he struggles to extract opal.