After exploring the Keyhole Chamber, the team uncovers evidence of another Aztec treasure chamber below Blind Frog Ranch called the Golden Staircase.

The team descends into the secret Mormon mine entrance where the team finally finds the Keyhole Chamber and uncovers the truth about the Aztec gold.

When an underground tsunami floods the cavern system, Duane and his team attempt to breach it from higher ground -- discovering evidence of Aztec artifacts and a crucial clue to the Lost Rhodes mine.

After a long winter, the crew returns to Blind Frog Ranch to strategize a new plan to get the box out of the underwater cave. And Charlie asks for help to investigate a mysterious death on the ranch.

Following the clues from a secret Mormon journal, the team discovers a collapsed mine entrance that they believe leads to the Keyhole Chamber and the lost Aztec treasure.

After uncovering a bar of gold at the Bead Site, Chad and James set out to research where it might have come from. With trespassers still threatening the ranch, their discovery sets them on the path of the fabled Lost Rhodes Mine.

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.

Chad and Eric discover an abandoned mine deep in the mountains and suspect they are being stalked. At the Bead Site, the team unearths evidence of sacrifice.

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 dives into a flooded cave system after a tantalizing discovery.

While drilling into the cavern system to find the Aztec gold, the team strikes an impenetrable object deep below ground.

When Duane Ollinger falls ill, treasure hunter Josh Feldman takes over the hunt for Aztec gold; Josh and his father track down a Mormon journal that holds clues about the treasure.

The team drills into volatile ground above the Golden Staircase as outsiders get uncomfortably close. After blasting through a massive boulder, they break into a hidden tunnel and rappel down to explore what lies below.

Chad and Eric find signs of gold at the abandoned mine, but nightfall brings an unwanted stalker to their camp. At the Bead Site, the team unearths an ancient structure.

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.

Chad and Eric explore a deep cavern while Duane discovers smoke vents.

A mystery lurking underground forces the team to reevaluate their safety.

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.

Charlie consults local experts to expel powerful forces lingering on the ranch while the team deploys cutting-edge tech to scan beneath the mysterious stone door.

Duane recruits treasure hunter Josh Feldman, who recommends a new plan of action to find the Aztec gold. But before they can break ground, a local Timpanogos tribal elder visits the ranch with disturbing words of warning.

Duane Ollinger sinks everything he has into hunting for what he believes is a vast fortune of gold on his property; with each step he takes closer to finding the treasure, the land appears to hold on tighter and stop him in his tracks.

Duane uncovers a whole new mystery about the land he owns.

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.

Duane and Chad Ollinger return to Blind Frog Ranch, armed with cutting-edge tech, to unearth $3 billion in hidden treasure. Shocking new information on the underground tunnel emerges. Claim jumpers invade the property, threatening to derail everything.

James and Josh continue to decipher clues from the Rhodes journal map in their search for the mysterious Golden Staircase.

Chad makes a huge mistake, derailing the operation to drag the box out of the cavern. But when they pull out some of the box's contents, they are shocked by what they discover.