Duane Ollinger believes there's a fortune of gold buried beneath his property in Utah, Blind Frog Ranch. But even though the land seems to be fighting him at every turn, he's not going to stop until he gets his hands on the gold -- whatever the cost.
With an access tunnel to the underground cavern finally opened, and a tantalizing clue discovered, Duane's son Chad takes a risky dive into the flooded cave system -- and what he finds defies all explanation.
Duane decides that the flooded cave is too dangerous to dive into again, forcing the team to explore new access points to the underground cavern system. But something lurking in the darkness forces everyone to reevaluate their safety.
While searching unexplored areas of the ranch for an alternate entrance to the cavern system, the team discovers mysterious ancient markings on a cliffside and a mining shaft dug deep into the mountain that could lead them right to the gold.
Duane employs ground-penetrating radar to scan the land near a potential drill site, leading to a mysterious finding; trespassers prompt Charlie to increase security with a camera system and captures a frightening sight in the dead of night.
As winter closes in and the digging season nears its end, Duane takes a final shot at getting into the underground cavern ... but uncovers a whole new mystery about the land he owns.
The results from radiocarbon testing are in, which will tell Duane if the box is Aztec or not. Meanwhile, the men discover they are being surveilled by a high-tech camera mounted just above the cave entrance.
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 Duane makes a costly mistake, Eric and Chad finally discover what they've been looking for. However, the crew gets caught in the cross hairs of mysterious intruders.
Duane and Chad Ollinger return to Blind Frog Ranch, armed with 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.
Searching for the hidden entrance to the cave system, the team uncovers an ancient vent shaft above the Energy Zone, but an explosion triggers an underground tsunami that threatens to flood the cave system.
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 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.
Following the trail of the Lost Rhoades Mine, Chad and Ryan attempt to rappel down a 250-foot cliff in a dangerous maneuver to access the Mormon Eye cave. While trekking at high altitude, James suffers a health scare. And back on the ranch, when Duane uncovers more poacher sites, he decides to take matters into his own hands.
Now that the floodwaters have receded at the Energy Zone, the team prepares to resume drilling into the cavern system. Duane takes a stand to remove the poachers from his property. Charlie unearths a deer carcass with unusual bite marks on it.
While drilling into the cavern system to find the Aztec gold, the team strikes an impenetrable object deep below ground. Tests of the site reveal the truth about the Energy Zone and what lies beneath Blind Frog Ranch.
After hitting a meteorite deep underground while trying to drill into the cavern system, the team searches for an alternate route. While scouring the area, Chad discovers a clue that finally leads to a breakthrough.
Duane and Chad Ollinger return to Blind Frog Ranch to lay out their plan of attack to find the Aztec treasure they believe is hidden underground; experts analyze the evidence that has been uncovered so far.
Geologist Eric Drummond and Chad Ollinger explore a newly discovered cavern deep underground. Duane finds smoke vents at the Bead Site, and James heads to the Aztec capital in Mexico City.
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.
Eric and Chad encounter disaster while attempting to breach the void in the South Cave. A mysterious rumbling shakes the ranch, and James finds evidence of the Aztecs at the Bead Site.
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 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.
Disaster strikes when Duane and Charlie attempt to drill down a smoke vent at the Bead Site. Chad and Josh follow the fault line back to the collapsed mine. Eric explores an indigenous site in Ohio that holds clues to Blind Frog Ranch.
Believing they might have drilled into an Aztec aqueduct at the Bead Site, Duane and James head to Mexico to meet an expert. Chad and Josh trace the underground waterway to a remote lake that might be protecting a secret.
A hidden cave entrance below a lake could finally lead the team into the Keyhole Chamber. After training in Florida with some of the best cave divers in the world, Chad navigates a deadly maze of flooded tunnels and makes a shocking discovery.
