The Blacklighters are forced into treacherous abandoned tunnels, searching for a new location. The Bishop and Scott dig overnight in a race against thieves.
The Taranto brothers risk man and machine moving their entire operation and the Blacklighters win a dugout at auction but get more than they bargained for.
A mountain of mine-waste rains down on the Blacklighters, threatening their operation. The Mooka boys head for a abandoned mineshaft believed to be full of cut opal.