Determined to get into the cavern, Duane and his team explore new methods to find a dry entrance. While Chad takes to the skies in search of a natural opening. Eric thinks the radioactive rocks found in the box might show them where to dig.

After the crew drills into a dry cavern, they must devise a plan to protect themselves from radioactivity and poisonous gasses. But as they get close to finally entering the cave, trespassers descend upon the ranch.