A crippled bulldozer threatens to derail the Tarantos' dreams. The Young Guns face brake failure, impenetrable rock and intense heat.

In the final week of the season, high temperatures are shutting down machines and pushing the miners to their limits. Struggling to set up their new open-cut mine, the Blacklighters take a chance on mining at night. The Young Guns search for black opal in Lightning Ridge, but a torrential storm forces them to work on a series of flooded dirt roads. The Bushmen risk it all in a dangerous area vandalized by opal thieves.