Chad dives into the underwater passage, uncovering a direct path to the Keyhole Chamber. Eric returns from a meteorite site similar to their findings at Blind Frog. An intruder on the Ranch removes a mysterious piece of equipment.

Chad traces the underground cavern to a mysterious bear marker and a cave hiding a gold ledger, which points them to an ancient Aztec outpost.

After a mysterious trailer appears on the Ranch's property, Duane is determined to find out who is spying on Blind Frog Ranch; the team uncovers the purpose of the cylinder and discovers that the government has been tracking UAP activity in the area.

Chad and Josh trace the flooded tunnel to a mysterious stone structure containing Aztec artifacts that reveal an ancient battle to protect the gold; Eric uncovers a fault line caused by a meteorite impact, leading to an entrance underground.

The team drills under the armory to access the flooded area underground, but they make an unexpected discovery that could detonate Blind Frog Ranch; unfazed by the dangerous surroundings, Duane pushes forward to find the Aztec gold.

As they continue trying to enter the Aztec gold chamber, the Ollingers take on their biggest project yet, draining the pond; but when a health crisis strikes Duane, Chad must take the lead.

The team embarks on an expedition to a remote meteorite impact site, located on a treacherous mountain above the ranch; they uncover clues that lead them to an underground cavern; as Duane's health continues to decline, Chad must step up.