With water running critically low at their only wash dam, the Cheals work double-time to restore a second agitator. Convinced they've hit the jackpot underground, Oscar and Luca are humbled by the fickle nature of opal. Blacklighters Mark I'Anson and Paul Coon get boxed in during their monumental mission to clear nine meters of overburden at their new Servo claim, forcing John Nassar to wrangle Opalzilla at their 12 Mile claim alone. Amidst a relentless drought threatening to shut down their mining operation, Slim Pickings battles a bung wall breach and opal-smashing 'shin crackers,' forcing them to utilize grizzly bars to save their stones.